WO2022172418A1 - Power conversion device, motor driving device, and refrigeration-cycle application instrument - Google Patents

Power conversion device, motor driving device, and refrigeration-cycle application instrument Download PDF

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Publication number
WO2022172418A1
WO2022172418A1 PCT/JP2021/005358 JP2021005358W WO2022172418A1 WO 2022172418 A1 WO2022172418 A1 WO 2022172418A1 JP 2021005358 W JP2021005358 W JP 2021005358W WO 2022172418 A1 WO2022172418 A1 WO 2022172418A1
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WO
WIPO (PCT)
Prior art keywords
power
control
current
capacitor
inverter
Prior art date
Application number
PCT/JP2021/005358
Other languages
French (fr)
Japanese (ja)
Inventor
浩一 有澤
卓也 下麥
貴昭 ▲高▼原
遥 松尾
啓介 植村
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN202180092491.5A priority Critical patent/CN116783810A/en
Priority to PCT/JP2021/005358 priority patent/WO2022172418A1/en
Priority to JP2022581131A priority patent/JPWO2022172418A1/ja
Priority to US18/259,340 priority patent/US20240063708A1/en
Publication of WO2022172418A1 publication Critical patent/WO2022172418A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/16—Means for providing current step on switching, e.g. with saturable reactor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4283—Arrangements for improving power factor of AC input by adding a controlled rectifier in parallel to a first rectifier feeding a smoothing capacitor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/13—Vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/171—Speeds of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21154—Temperatures of a compressor or the drive means therefor of an inverter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21156—Temperatures of a compressor or the drive means therefor of the motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/07—DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/09—Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/15—Power factor Correction [PFC] circuit generating the DC link voltage for motor driving inverter

Definitions

  • the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that convert AC power into desired power.
  • a power conversion device that converts AC power supplied from an AC power supply into desired AC power and supplies it to a load such as an air conditioner.
  • a power converter which is a control device for an air conditioner, rectifies AC power supplied from an AC power supply with a diode stack, which is a rectifier, and smoothes the power with a smoothing capacitor.
  • a technology is disclosed in which the AC power is converted into a desired AC power by an inverter composed of switching elements and output to a compressor motor, which is a load.
  • the present disclosure has been made in view of the above, and an object thereof is to obtain a power conversion device capable of suppressing an increase in device size while suppressing deterioration of a smoothing capacitor.
  • a power conversion device rectifies first AC power supplied from a commercial power supply and boosts the voltage of the first AC power.
  • the control unit determines the operation mode according to the load state, which is the operating state of the inverter, the motor, and the equipment.
  • the power converter according to the present disclosure has the effect of suppressing the deterioration of the smoothing capacitor and suppressing the enlargement of the device.
  • FIG. 1 is a first diagram showing a configuration example of a power converter according to Embodiment 1; A second diagram showing a configuration example of the power converter according to Embodiment 1 A third diagram showing a configuration example of the power converter according to Embodiment 1
  • the smoothing unit smoothes the current output from the boosting unit and shows an example of each current and the capacitor voltage of the smoothing unit when the current flowing through the inverter is kept constant.
  • FIG. 4 is a diagram showing examples of currents and capacitor voltages of capacitors in the smoothing unit when the control unit of the power converter according to Embodiment 1 controls the operation of the inverter to reduce the current flowing in the smoothing unit;
  • FIG. 1 is a first diagram showing a configuration example of a power converter according to Embodiment 1
  • a second diagram showing a configuration example of the power converter according to Embodiment 1 A third diagram showing a configuration example of the power converter according to Embodiment 1
  • the smoothing unit smoothes the current output from the boosting unit
  • FIG. 1 shows operation modes of the power converter according to Embodiment 1 and the contents of the operation modes
  • a second diagram showing operation modes of the power converter according to Embodiment 1 and the contents of the operation modes 4 is a flow chart showing the operation of the control unit included in the power converter according to Embodiment 1
  • FIG. 2 is a diagram showing an example of a hardware configuration that realizes a control unit included in the power converter according to Embodiment 1
  • a power conversion device, a motor drive device, and a refrigeration cycle application device will be described below in detail based on the drawings.
  • FIG. 1 is a first diagram showing a configuration example of a power conversion device 1 according to Embodiment 1.
  • FIG. Power converter 1 is connected to commercial power source 110 and compressor 315 .
  • Power converter 1 converts first AC power having power supply voltage Vs supplied from commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to compressor 315 .
  • the power converter 1 includes a rectifying section 130, a boosting section 600, a current detecting section 501, a smoothing section 200, a current detecting section 502, an inverter 310, current detecting sections 313a and 313b, a control section 400, Prepare.
  • the rectifying section 130 and the boosting section 600 constitute a rectifying and boosting section 700 .
  • a motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 .
  • the rectifying section 130 has a bridge circuit composed of rectifying elements 131 to 134, rectifies the first AC power of the power supply voltage Vs supplied from the commercial power supply 110, and outputs it.
  • the rectifier 130 performs full-wave rectification.
  • the booster section 600 has a reactor 631 , a switching element 632 and a diode 633 .
  • Boosting section 600 turns switching element 632 on and off under the control of control section 400 , boosts the power output from rectifying section 130 , and outputs the boosted power to smoothing section 200 .
  • the boosting unit 600 is controlled by the control unit 400 in full PAM (Pulse Amplitude Modulation) in which the switching element 632 continuously performs switching operations.
  • the power converter 1 performs power factor improvement control of the commercial power source 110 by the step-up unit 600 to make the capacitor voltage Vdc of the capacitor 210 of the smoothing unit 200 higher than the power supply voltage Vs.
  • Rectifying and boosting section 700 rectifies the first AC power supplied from commercial power supply 110 and boosts the voltage of the first AC power supplied from commercial power supply 110 by means of rectifying section 130 and boosting section 600 .
  • rectifying section 130 and boosting section 600 are connected in series.
  • the current detection unit 501 detects the current value of the power boosted by the booster unit 600 and outputs the detected current value to the control unit 400 .
  • the smoothing section 200 is connected to the output terminal of the boosting section 600 .
  • Smoothing section 200 has capacitor 210 as a smoothing element, and smoothes the power boosted by boosting section 600 .
  • Capacitor 210 is, for example, an electrolytic capacitor, a film capacitor, or the like.
  • Capacitor 210 has a capacity for smoothing the power rectified by rectifying section 130, and the voltage generated in capacitor 210 by the smoothing does not have the shape of a full-wave rectified waveform of commercial power supply 110, but the DC component of the commercial power supply. It has a waveform shape in which voltage ripples corresponding to the frequency of 110 are superimposed, and does not pulsate greatly.
  • the frequency of this voltage ripple is a component twice the frequency of the power supply voltage Vs when the commercial power supply 110 is single-phase, and the main component is a frequency component six times the frequency of the power supply voltage Vs when the commercial power supply 110 is three-phase. If the power input from commercial power supply 110 and the power output from inverter 310 do not change, the amplitude of this voltage ripple is determined by the capacitance of capacitor 210 . For example, it pulsates in such a range that the maximum value of the voltage ripple generated in the capacitor 210 is less than twice the minimum value.
  • the current detection unit 502 detects the current value of the current flowing through the inverter 310 and outputs the detected current value to the control unit 400 .
  • the inverter 310 is connected to both ends of the smoothing section 200 , that is, the capacitor 210 .
  • Inverter 310 has switching elements 311a-311f and freewheeling diodes 312a-312f.
  • Inverter 310 turns on and off switching elements 311a to 311f under the control of control unit 400, converts the power output from rectifying/boosting unit 700 and smoothing unit 200 into second AC power having desired amplitude and phase,
  • the power is output to a compressor 315, which is a device on which a motor 314 is mounted.
  • Current detection units 313 a and 313 b each detect a current value of one phase out of three-phase currents output from inverter 310 and output the detected current value to control unit 400 .
  • Control unit 400 acquires two-phase current values among the three-phase current values output from inverter 310, thereby calculating the remaining one-phase current value output from inverter 310.
  • Compressor 315 is a load having a motor 314 for driving the compressor. Motor 314 rotates according to the amplitude and phase of the second AC power supplied from inverter 310 to perform compression operation.
  • the compressor 315 is a hermetic compressor used in an air conditioner or the like
  • the load torque of the compressor 315 can often be regarded as a constant torque load.
  • FIG. 1 shows a case where the motor windings are Y-connected, but this is only an example and the present invention is not limited to this.
  • the motor windings of the motor 314 may be delta-connection, or may be switchable between Y-connection and delta-connection.
  • the rectifying and boosting unit 700 includes four switching elements, and turns on and off the four switching elements under the control of the control unit 400 to rectify and boost the first AC power output from the commercial power supply 110. Power may be output to smoothing section 200 . Further, the rectifying/boosting section 700 may be configured such that the boosting section is connected in parallel with the rectifying section 130 .
  • FIG. 2 is a second diagram showing a configuration example of the power converter 1 according to the first embodiment.
  • the power conversion device 1 is obtained by replacing the rectification/boost section 700 with a rectification/boost section 701 in the power conversion device 1 shown in FIG.
  • a motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 .
  • Rectifying and boosting section 701 has a reactor 631, switching elements 611-614, and rectifying elements 621-624 each connected in parallel to one of switching elements 611-614.
  • the reactor 631 of this configuration is inserted only in the one-side connection line between the commercial power source 110 and the rectifying/boosting section 701, it may be inserted in the both-side connection line.
  • Rectifying and boosting section 701 turns switching elements 611 to 614 on and off under the control of control section 400, rectifies and boosts the first AC power output from commercial power supply 110, and outputs the boosted power to smoothing section 200. do.
  • the rectifying/boosting unit 701 is controlled by the control unit 400 in full PAM, in which the switching elements 611 to 614 continuously perform switching operations.
  • FIG. 3 is a third diagram showing a configuration example of the power converter 1 according to the first embodiment.
  • the power conversion device 1 is obtained by replacing the rectification/boost section 700 with a rectification/boost section 702 in the power conversion device 1 shown in FIG.
  • a motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 .
  • Rectifying and boosting section 702 has reactor 120 , rectifying section 130 , and boosting section 601 .
  • Boosting section 601 has rectifying elements 621 to 624 and switching element 611 .
  • Boosting section 601 turns switching element 611 on and off under the control of control section 400 , boosts the first AC power output from commercial power supply 110 , and outputs the boosted power to rectifying section 130 .
  • the boosting unit 601 of the rectifying boosting unit 702 is controlled by the control unit 400 to perform the switching operation of the switching element 611 once or a plurality of times per half cycle of the frequency of the first AC power supplied from the commercial power supply 110 . Controlled by switching.
  • the power converter 1 shown in FIG. 1 will be used as an example.
  • the current detection units 501, 502, 313a, and 313b may be collectively referred to as a detection unit.
  • the current values detected by the current detection units 501, 502, 313a, and 313b may be referred to as detection values.
  • the power electronics device 1 may include a detector other than the detector described above. Although omitted in FIG. 1, the power conversion device 1 generally includes a detection unit that detects the capacitor voltage Vdc.
  • the power conversion device 1 may include a detection unit that detects the voltage, current, and the like of the first AC power supplied from the commercial power source 110 .
  • the control unit 400 acquires the current value of the power boosted by the boosting unit 600 from the current detection unit 501, acquires the current value of the current flowing through the inverter 310 from the current detection unit 502, and acquires the current value of the current flowing through the inverter 310 from the current detection units 313a and 313b. Obtain the current value of the second AC power having the desired amplitude and phase converted by 310 .
  • the control unit 400 controls the operation of the boosting unit 600 of the rectifying/boosting unit 700, specifically, the switching element 632 included in the boosting unit 600, by using the detection values detected by the respective detection units.
  • control unit 400 controls the operation of the inverter 310, specifically, ON/OFF of the switching elements 311a to 311f included in the inverter 310, using the detection values detected by the respective detection units.
  • the control unit 400 controls the operation of the rectifying/boosting unit 700 .
  • Control unit 400 controls the operation of rectifying and boosting unit 700 , performs power factor improvement control of the first AC power supplied from commercial power supply 110 , and average voltage control of capacitor 210 of smoothing unit 200 .
  • control unit 400 causes inverter 310 to output second AC power including pulsation corresponding to the pulsation of power flowing into capacitor 210 of smoothing unit 200 from rectifying and boosting unit 700 to compressor 315 as a load.
  • the pulsation corresponding to the pulsation of the power flowing into the capacitor 210 of the smoothing section 200 is, for example, the pulsation that varies depending on the frequency of the pulsation of the power flowing into the capacitor 210 of the smoothing section 200 .
  • the control unit 400 suppresses the current flowing through the capacitor 210 of the smoothing unit 200 . Note that the control unit 400 does not have to use all the detection values acquired from each detection unit, and may perform control using some of the detection values.
  • the load generated by inverter 310 and compressor 315 can be regarded as a constant load.
  • the following description assumes that a current load is connected.
  • the current flowing from boosting section 600 is current I1
  • the current flowing to inverter 310 is current I2
  • the current flowing from smoothing section 200 is current I3.
  • the current I2 is the sum of the currents I1 and I3.
  • Current I3 can be expressed as the difference between currents I2 and I1, ie current I2-current I1.
  • the current I3 has a positive direction in the discharging direction of the smoothing section 200 and a negative direction in the charging direction of the smoothing section 200 . That is, current may flow into or out of the smoothing section 200 .
  • FIG. 4 shows, as a comparative example, currents I1 to I3 and the capacitor 210 of the smoothing unit 200 when the current output from the boosting unit 600 is smoothed by the smoothing unit 200 and the current I2 flowing through the inverter 310 is kept constant.
  • FIG. 4 is a diagram showing an example of voltage Vdc; From the top, current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown.
  • the vertical axis of currents I1, I2, and I3 indicates current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t.
  • control unit 400 controls current I2 flowing through inverter 310, that is, controls the operation of inverter 310, so as to reduce current I3 flowing through smoothing unit 200.
  • FIG. 5 shows the respective currents I1 to I3 and the capacitor of the smoothing unit 200 when the control unit 400 of the power converter 1 according to Embodiment 1 controls the operation of the inverter 310 to reduce the current I3 flowing through the smoothing unit 200.
  • 210 is a diagram showing an example of the capacitor voltage Vdc of 210.
  • FIG. From the top current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown.
  • the vertical axis of currents I1, I2, and I3 indicates current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t.
  • the control unit 400 of the power conversion device 1 controls the operation of the inverter 310 so that the current I2 shown in FIG.
  • the frequency component of the current flowing into the smoothing section 200 can be reduced, and the current I3 flowing into the smoothing section 200 can be reduced.
  • control unit 400 controls the operation of inverter 310 so that current I2 containing a pulsating current whose main component is the frequency component of current I1 flows through inverter 310 .
  • the frequency component of the current I1 is determined by the frequency of the alternating current supplied from the commercial power supply 110, the configuration of the rectifying section 130, and the switching speed of the switching element 632 of the boosting section 600. Therefore, control unit 400 can make the frequency component of the pulsating current superimposed on current I2 a component having a predetermined amplitude and phase.
  • the frequency component of the pulsating current superimposed on the current I2 has a waveform similar to that of the current I1.
  • the control unit 400 reduces the current I3 flowing through the smoothing unit 200 and reduces the pulsating voltage generated in the capacitor voltage Vdc. can do.
  • Controlling the pulsation of the current flowing through the inverter 310 by controlling the operation of the inverter 310 by the control unit 400 is the same as controlling the pulsation of the second AC power output from the inverter 310 to the compressor 315. is.
  • Control unit 400 controls the operation of inverter 310 so that the pulsation contained in the second AC power output from inverter 310 is smaller than the pulsation of the power output from rectifying and boosting unit 700 .
  • Control unit 400 controls that the voltage ripple of capacitor voltage Vdc, that is, the voltage ripple generated in capacitor 210 does not include pulsation corresponding to the pulsation of the power flowing into capacitor 210 in the second AC power output from inverter 310.
  • the amplitude and phase of the pulsation contained in the second AC power output from inverter 310 are controlled so as to be smaller than the voltage ripple generated in capacitor 210 when the voltage is high.
  • the second AC power output from inverter 310 does not include pulsation corresponding to the pulsation of the power flowing into capacitor 210, it means control as shown in FIG.
  • the alternating current supplied from the commercial power supply 110 is not particularly limited, and may be single-phase or three-phase.
  • Control unit 400 may determine the frequency component of the pulsating current superimposed on current I2 according to the first AC power supplied from commercial power supply 110 . Specifically, when the first AC power supplied from commercial power supply 110 is single-phase, control unit 400 sets the pulsating waveform of current I2 flowing in inverter 310 to twice the frequency of the first AC power. In the case where the first AC power supplied from the commercial power supply 110 is three-phase, the pulsation waveform having the frequency component six times the frequency of the first AC power as the main component is added with the DC component. Control.
  • the pulsation waveform is, for example, the shape of the absolute value of a sine wave or the shape of a sine wave.
  • the control unit 400 may add at least one frequency component of integral multiples of the sine wave frequency to the pulsating waveform as a predetermined amplitude.
  • the pulsating waveform may be in the shape of a rectangular wave or in the shape of a triangular wave. In this case, control unit 400 may set the amplitude and phase of the pulsation waveform to predetermined values.
  • Control unit 400 may use the voltage applied to capacitor 210 or the current flowing through capacitor 210 to calculate the amount of pulsation included in the second AC power output from inverter 310 , or The voltage or current of the supplied first AC power may be used to calculate the amount of pulsation included in the second AC power output from inverter 310 .
  • control unit 400 controls inverter 310 so that second AC power including frequency components different from the frequency components of first AC power supplied from commercial power supply 110 is output from inverter 310 to compressor 315 .
  • the frequency component included in the second AC power output from inverter 310 to compressor 315 may be superimposed on the driving signal for turning on/off switching element 632 of booster 600 .
  • the control unit 400 controls the first AC power or, if the first AC power supplied from the commercial power supply 110 is three-phase, the power containing a fluctuating frequency component other than the frequency component six times the frequency of the first AC power.
  • the operation of the rectifying/boosting section 700 specifically, the operation of the switching element 632 of the boosting section 600 is controlled so as to output from the rectifying/boosting section 700 .
  • Control unit 400 may control the fluctuating frequency component using a command value for commercial power supply 110, or may control the fluctuating frequency component to the 40th order of the frequency of the first AC power supplied from commercial power supply 110. It may be controlled so as not to be an integral multiple component, or to be a specified value, for example, a desired standard value or less.
  • the operation of the power converter 1 when the power converter 1 is mounted on a refrigeration cycle application device will be described.
  • the operation mode of the power conversion device 1 greatly changes depending on the operating state of the air conditioner. For example, in a room to be air-conditioned by the air conditioner, if the temperature difference between the user's set temperature, that is, the user's desired temperature and the current room temperature is large, the load of the power converter 1 mounted on the air conditioner becomes larger. On the other hand, when the temperature difference between the user's desired temperature and the current room temperature is small, the load on the power conversion device 1 mounted on the air conditioner is small.
  • the control unit 400 reduces the current I3 flowing through the smoothing unit 200 as described above, and reduces the pulsating voltage generated in the capacitor voltage Vdc. It is conceivable that it is not necessary to dare to reduce the control. Therefore, in the power conversion device 1, the control unit 400 performs the various controls described above according to the load state, which is the operating state of the load, and determines the operation mode.
  • the load is the inverter 310, the motor 314, and the device on which the motor 314 is mounted.
  • the device equipped with the motor 314 is, for example, the aforementioned compressor 315, the fan installed in the air conditioner, or the like, but is not limited to these.
  • FIG. 6 is a first diagram showing operation modes of the power converter 1 according to Embodiment 1 and the contents of the operation modes.
  • FIG. 7 is a diagram showing an operation mode when the boosting operation of the boosting unit 600 is on in the power converter 1. be.
  • the step-up operation is an operation in which the step-up section 600 steps up the power supply voltage Vs supplied from the commercial power source 110 in order to ensure the drive range of the motor 314 due to high rotation.
  • the control unit 400 controls on/off of the switching element 632 of the boosting unit 600 .
  • Vibration suppression control suppresses vibration by adjusting the torque applied from inverter 310 to the load torque fluctuation when vibration occurs due to load torque fluctuation caused by a mechanical mechanism such as compressor 315 during one rotation of motor 314 . It is control to suppress.
  • the overmodulation control is a control that increases the output voltage of the inverter 310 in order to drive the motor 314 in a high speed range.
  • the power converter 1 has a limited supply voltage. Therefore, when the power converter 1 rotates the motor 314 at a high speed, the electromotive force of the motor 314 becomes larger than the supply voltage, making it difficult to rotate.
  • the third harmonic component By including the third harmonic component, the fundamental wave component of the output voltage is slightly raised. As a result, the power conversion device 1 can increase the high rotation region of the motor 314 .
  • Constant torque control is control that keeps the torque given to the motor 314 from the inverter 310 constant. Constant torque control is also called constant current control. Even in a system with load torque fluctuations, the amount of vibration is not so large when operating in a relatively light load region. Therefore, by keeping the torque applied from the inverter 310 constant, the current waveform of the motor 314 becomes a sinusoidal waveform, that is, a waveform without pulsation, and high-efficiency operation can be performed. Constant torque control can be used when vibration is acceptable even in the high load region.
  • Power supply ripple compensation control is control to suppress ripple current caused by power supply ripple flowing through capacitor 210 of smoothing section 200 as described above. Ripple current caused by power supply pulsation passes through the capacitor 210 and transmits power to the load, thereby reducing stress on the capacitor 210 .
  • the operation modes include the operation of the rectifying and boosting unit 700, vibration suppression control for reducing vibration of the motor 314 or the equipment on which the motor 314 is mounted, overmodulation control of the inverter 310, constant torque control of the motor 314, and charge/discharge of the capacitor 210. It is a combination of presence/absence of power supply pulsation compensation control for suppressing current.
  • Control unit 400 determines whether or not each control shown in FIGS. 6 and 7 is performed according to the load state. That is, the control unit 400 determines the presence or absence of each control according to the load state, and maintains or switches the operation mode.
  • FIG.6 and FIG.7 although five items were mentioned as the specific content of the operation mode, it is an example and is not limited to these.
  • Items other than the five items include, for example, flux-weakening control. That is, the operating mode may include flux-weakening control.
  • the flux-weakening control is a control that widens the high rotation range of the motor 314 by applying a negative d-axis current to the motor 314 to reduce the apparent electromotive force. This control, like the overmodulation control, is used as a countermeasure against motor voltage saturation, and is used in combination with the overmodulation control.
  • the power converter 1 can detect the current I1 based on the current value, for example, the value detected by the current detection unit 501, and the current I2 based on the value detected by the current detection unit 502. In addition, the power conversion device 1 determines the load state based on the temperature, for example, the detected value of the temperature sensor of the indoor unit provided in the air conditioner, the detected value of the temperature sensor of the outdoor unit, etc. when installed in the air conditioner. can be detected.
  • the power conversion device 1 may include a temperature sensor around the substrate of the inverter 310 to detect the temperature around the substrate of the inverter 310 , or may include a temperature sensor around the motor 314 to detect the temperature around the motor 314 . may be detected.
  • the power converter 1 generates the operating speed, for example, the operating speed of the motor 314 of the compressor 315, the fan (not shown) mounted on the air conditioner, etc. in the process of control by the control unit 400 for the load state. It can be directly or indirectly detected from a command value to be applied or an estimated value estimated from the operating frequency in the process of control by the control unit 400 .
  • the load state includes the detection value of the detection unit that detects the physical quantity of the inverter 310, the motor 314, or the compressor 315, the command value generated in the control process of the control unit 400, and the Obtained by at least one of the estimated values estimated in the control process.
  • the physical quantity may be, for example, a voltage value, an operating speed, etc., in addition to the aforementioned current value and temperature. That is, the physical quantity includes at least one of current, voltage, temperature, and operating speed.
  • Operation mode 1 is a combination of no boost operation, no vibration suppression control, no overmodulation control, no constant torque control, and no power supply ripple compensation control.
  • the operation mode 1 is used for operation when no boosting operation is performed, mechanically-induced vibration is small, motor voltage saturation is not reached, and load current ripple and power supply current ripple are small.
  • Operation mode 2 is a combination of no boost operation, no vibration suppression control, no overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 2 does not perform boosting operation, causes less mechanical vibration, does not reach motor voltage saturation, and causes less load current pulsation.
  • Operation mode 3 is a combination of no boost operation, vibration suppression control, no overmodulation control, no constant torque control, and no power supply ripple compensation control. Operation mode 3 does not perform boosting operation, does not reach motor voltage saturation, and is used for operation when it is desired to suppress mechanically-induced vibrations, although load current pulsation and power supply current pulsation are small.
  • Operation mode 4 is a combination of no boost operation, vibration suppression control, no overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 4 does not perform boosting operation, does not reach motor voltage saturation, and has small load current pulsation, but is used for operation when it is desired to suppress mechanically-induced vibration and power supply current pulsation.
  • Operation mode 5 is a combination of no boost operation, no vibration suppression control, overmodulation control, no constant torque control, and no power supply ripple compensation control. Operation mode 5 does not perform boosting operation, and is used for operation, etc., when it is desired to take countermeasures against motor voltage saturation, although mechanically-induced vibration is small and load current pulsation and power supply current pulsation are small.
  • Operation mode 6 is a combination of no boost operation, no vibration suppression control, overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 6 does not perform boosting operation, and is used for operation when it is desired to take countermeasures against motor voltage saturation and power supply current pulsation suppression, although mechanically-induced vibration is small and load current pulsation is small.
  • Operation mode 7 is a combination of no boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 7 does not perform boosting operation, and is used for operation when it is desired to suppress mechanically-induced vibration and prevent motor voltage saturation, although load current pulsation and power supply current pulsation are small.
  • Operation mode 8 is a combination of no boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 8 does not perform boosting operation, and although load current pulsation is small, it is used for operation when it is desired to suppress mechanically-induced vibration and take measures against motor voltage saturation and power supply current pulsation.
  • Operation mode 9 is a combination of no boost operation, no vibration suppression control, no overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 9 does not perform boosting operation, the vibration caused by the mechanism is small, the motor voltage is not saturated, and the power supply current ripple is small. Used for driving, etc.
  • Operation mode 10 is a combination of no boost operation, no vibration suppression control, no overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 10 does not perform boosting operation, the vibration caused by the mechanism is small, and the motor voltage does not reach saturation, but suppresses the decrease in efficiency due to load current pulsation (energy saving operation), and the operation when it is desired to suppress power supply current pulsation. used for
  • Operation mode 11 is a combination of no boost operation, no vibration suppression control, overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 11 does not perform boosting operation, has small mechanically-induced vibration, and has small power supply current pulsation. used for
  • Operation mode 12 is a combination of no boost operation, no vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 12 does not perform voltage step-up operation, and although mechanically-induced vibration is small, measures against motor voltage saturation are taken to suppress efficiency drops due to load current pulsations (energy-saving operation), and power supply current pulsations are to be taken. etc.
  • Operation mode 13 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 13 is used for operation when the vibration caused by the mechanism is small, the motor voltage is not saturated, and the load current pulsation and the power supply current pulsation are small when the voltage boosting operation is performed.
  • Operation mode 14 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 14 is used for operation when power source current pulsation is desired to be suppressed, although mechanically-induced vibration is small, motor voltage saturation does not occur, and load current pulsation is small when step-up operation is performed.
  • Operation mode 15 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 15 is used when the motor voltage is not saturated and the load current pulsation and the power supply current pulsation are small when performing the boosting operation, but it is desired to suppress mechanical vibrations.
  • Operation mode 16 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 16 is used when the motor voltage is not saturated and the load current pulsation is small when the voltage boosting operation is performed, but it is desired to suppress mechanically-induced vibration and power supply current pulsation.
  • Operation mode 17 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 17 is used for operation when the vibration caused by the mechanism is small, and the load current pulsation and the power supply current pulsation are small when the step-up operation is performed, but the motor voltage saturation countermeasure is to be taken.
  • Operation mode 18 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 18 is used for operation when the vibration due to the mechanism is small and the load current ripple is small when performing the boosting operation, but the motor voltage saturation countermeasure and the power supply current ripple suppression are desired.
  • Operation mode 19 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 19 is used for operation when the load current pulsation and the power supply current pulsation are small when the voltage boosting operation is performed, but the mechanically-induced vibration is suppressed and the motor voltage saturation countermeasure is to be taken.
  • Operation mode 20 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 20 is used for operation when the load current pulsation is small when performing the boosting operation, but mechanically-induced vibration is suppressed, and countermeasures against motor voltage saturation and power supply current pulsation are desired.
  • Operation mode 21 is a combination of boost operation, no vibration suppression control, no overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 21 is used when boosting the voltage, the mechanical vibration is small, the motor voltage is not saturated, and the power supply current ripple is small. Used for driving, etc.
  • Operation mode 22 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the operation mode 22 when the voltage is boosted, the vibration caused by the mechanism is small, and the motor voltage is not saturated, but the efficiency drop due to the load current pulsation is suppressed (energy-saving operation), and the power supply current pulsation is suppressed. used for
  • Operation mode 23 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • Operation mode 23 is an operation in which the vibration caused by the mechanism is small and the power supply current pulsation is small when performing the boosting operation, but it is desired to suppress the efficiency drop due to the load current pulsation by taking measures against the motor voltage saturation (energy-saving operation). used for
  • Operation mode 24 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control.
  • the mechanically-induced vibration is small when boosting, but the motor voltage saturation countermeasure is taken to suppress the efficiency drop due to the load current pulsation (energy-saving operation). etc.
  • control unit 400 can determine whether or not to perform power supply ripple compensation control according to the capacity of the capacitor 210, for example. In addition, the control unit 400 can determine whether or not to perform vibration suppression control according to the amount of work of the device in which the motor 314 is mounted, that is, the compressor 315 .
  • FIG. 8 is a flow chart showing the operation of the control unit 400 included in the power conversion device 1 according to the first embodiment.
  • the control unit 400 acquires the load state of the power converter 1 (step S1).
  • the control unit 400 determines the presence or absence of each control from the acquired load state, and determines the operation mode according to the load state (step S2).
  • the control unit 400 confirms whether or not the determined operation mode is the same as the previous time (step S3). If the operation mode is the same as last time (step S3: Yes), the control unit 400 maintains the previous operation mode (step S4). If the operating mode is different from the last time (step S3: No), the control unit 400 switches the operating mode (step S5).
  • FIG. 9 is a diagram showing an example of a hardware configuration that implements the control unit 400 included in the power conversion device 1 according to Embodiment 1. As shown in FIG. Control unit 400 is implemented by processor 91 and memory 92 .
  • the processor 91 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or a system LSI (Large Scale Integration).
  • the memory 92 is a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory), a volatile memory or a non-volatile Read Only memory.
  • a semiconductor memory can be exemplified.
  • the memory 92 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
  • the control unit 400 controls the operation of the inverter 310 based on the detection values acquired from the respective detection units, and the current I2 flowing through the inverter 310 Furthermore, by superimposing the pulsation of the frequency component corresponding to the frequency component of the current I1 flowing from the rectifying unit 130, the current I3 flowing through the smoothing unit 200 is reduced. As a result, the electric power conversion device 1 reduces the current I3 flowing through the smoothing unit 200, so that the capacitor 210 having a smaller ripple current resistance can be used as compared with the case where the control of the present embodiment is not performed. .
  • power conversion device 1 can reduce the capacity of capacitor 210 to be mounted as compared with the case where the control of the present embodiment is not performed, by reducing the pulsating voltage of capacitor voltage Vdc.
  • the power conversion device 1 can reduce the number of capacitors 210 configuring the smoothing unit 200 .
  • the power conversion device 1 controls the operation of the inverter 310 so that the pulsation contained in the second AC power is smaller than the pulsation of the power output from the rectifying unit 130, so that the current flowing through the inverter 310 is reduced. It is possible to suppress the pulsation component superimposed on I2 from becoming excessive. The superimposition of the pulsating component increases the effective value of the current flowing through the inverter 310, the motor 314, etc. compared to the non-superimposed state. It is possible to provide a system that suppresses the current capacity of the inverter 310, the loss increase of the inverter 310, the loss increase of the motor 314, and the like.
  • the power converter 1 can suppress the vibration of the compressor 315 caused by the pulsation of the current I2 by performing the control of the present embodiment.
  • the power conversion device 1 can increase the capacitor voltage Vdc of the capacitor 210 and expand the output voltage range of the inverter 310 by performing the boosting operation of the booster 600 .
  • the control unit 400 superimposes the pulsation frequency component included in the second AC power output from the inverter 310 on the driving signal for the switching element 632 of the boosting unit 600, thereby increasing the frequency component.
  • the resulting pulsation of current I3 and capacitor voltage Vdc can be reduced.
  • the power converter 1 maintains or switches the operation mode according to the load state.
  • the power electronics device 1 can perform energy-saving operation when possible without increasing the processing load unnecessarily.
  • FIG. 10 is a diagram showing a configuration example of a refrigeration cycle device 900 according to Embodiment 2.
  • a refrigerating cycle-applied equipment 900 according to the second embodiment includes the power converter 1 described in the first embodiment.
  • the refrigerating cycle applied equipment 900 according to Embodiment 2 can be applied to products equipped with a refrigerating cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters.
  • constituent elements having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.
  • Refrigerating cycle applied equipment 900 includes compressor 315 incorporating motor 314 according to Embodiment 1, four-way valve 902, indoor heat exchanger 906, expansion valve 908, and outdoor heat exchanger 910 with refrigerant pipe 912. attached through
  • a compression mechanism 904 that compresses the refrigerant and a motor 314 that operates the compression mechanism 904 are provided inside the compressor 315 .
  • the refrigeration cycle applied equipment 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902 .
  • the compression mechanism 904 is driven by a variable speed controlled motor 314 .
  • the refrigerant is pressurized by the compression mechanism 904 and sent out through the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, the outdoor heat exchanger 910, and the four-way valve 902. Return to compression mechanism 904 .
  • the refrigerant is pressurized by the compression mechanism 904 and sent through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906, and the four-way valve 902. Return to compression mechanism 904 .
  • the indoor heat exchanger 906 acts as a condenser to release heat, and the outdoor heat exchanger 910 acts as an evaporator to absorb heat.
  • the outdoor heat exchanger 910 acts as a condenser to release heat, and the indoor heat exchanger 906 acts as an evaporator to absorb heat.
  • the expansion valve 908 reduces the pressure of the refrigerant to expand it.
  • 1 power conversion device, 2 motor drive device, 110 commercial power supply, 120, 631 reactor, 130 rectification section, 131 to 134, 621 to 624 rectification element, 200 smoothing section, 210 capacitor, 310 inverter, 311a to 311f, 611 to 614 , 632 switching elements, 312a to 312f freewheeling diodes, 313a, 313b, 501, 502 current detectors, 314 motors, 315 compressors, 400 controllers, 600, 601 boosters, 633 diodes, 700, 701, 702 rectifier boosters , 900 refrigeration cycle application equipment, 902 four-way valve, 904 compression mechanism, 906 indoor heat exchanger, 908 expansion valve, 910 outdoor heat exchanger, 912 refrigerant piping.

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Abstract

A power conversion device (1) comprises: a rectification boost unit (700) for rectifying a first AC power supplied from a commercial power supply (110) and boosting the voltage of the first AC power; a capacitor (210) connected to the output end of the rectification boost unit (700); an inverter (310) that is connected to both ends of the capacitor (210), that converts the power outputted from the rectification boost unit (700) and the capacitor (210) to a second AC power, and that outputs the second AC power to an instrument having a motor (314) mounted thereon; and a control unit (400) that controls the action of the rectification boost unit (700), that controls the action of the inverter (310) so as to output, from the inverter (310) to the instrument, the second AC power including ripples according to power ripples flowing from the rectification boost unit (700) into the capacitor (210), and that suppresses the current flowing through the capacitor (210). The control unit (400) determines an operation mode in accordance with a load state.

Description

電力変換装置、モータ駆動装置および冷凍サイクル適用機器Power conversion device, motor drive device and refrigeration cycle application equipment
　本開示は、交流電力を所望の電力に変換する電力変換装置、モータ駆動装置および冷凍サイクル適用機器に関する。 The present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that convert AC power into desired power.
　従来、交流電源から供給される交流電力を所望の交流電力に変換し、空気調和機などの負荷に供給する電力変換装置がある。例えば、特許文献１には、空気調和機の制御装置である電力変換装置が、交流電源から供給される交流電力を整流部であるダイオードスタックで整流し、さらに平滑コンデンサで平滑した電力を、複数のスイッチング素子からなるインバータで所望の交流電力に変換し、負荷である圧縮機モータに出力する技術が開示されている。 Conventionally, there is a power conversion device that converts AC power supplied from an AC power supply into desired AC power and supplies it to a load such as an air conditioner. For example, in Patent Document 1, a power converter, which is a control device for an air conditioner, rectifies AC power supplied from an AC power supply with a diode stack, which is a rectifier, and smoothes the power with a smoothing capacitor. A technology is disclosed in which the AC power is converted into a desired AC power by an inverter composed of switching elements and output to a compressor motor, which is a load.
特開平７－７１８０５号公報JP-A-7-71805
　しかしながら、上記従来の技術によれば、平滑コンデンサに大きな電流が流れるため、平滑コンデンサの経年劣化が加速する、という問題があった。このような問題に対して、平滑コンデンサの容量を大きくすることでコンデンサ電圧のリプル変化を抑制する、またはリプルによる劣化耐量の大きい平滑コンデンサを使用する方法が考えられるが、コンデンサ部品のコストが高くなり、また装置が大型化してしまう。 However, according to the above conventional technology, a large current flows through the smoothing capacitor, so there is a problem that aging deterioration of the smoothing capacitor is accelerated. To address this problem, it is conceivable to increase the capacity of the smoothing capacitor to suppress the ripple change in the capacitor voltage, or to use a smoothing capacitor with a high resistance to deterioration due to ripple, but the cost of the capacitor parts is high. , and the size of the apparatus becomes large.
　本開示は、上記に鑑みてなされたものであって、平滑用のコンデンサの劣化を抑制しつつ、装置の大型化を抑制可能な電力変換装置を得ることを目的とする。 The present disclosure has been made in view of the above, and an object thereof is to obtain a power conversion device capable of suppressing an increase in device size while suppressing deterioration of a smoothing capacitor.
　上述した課題を解決し、目的を達成するために、本開示に係る電力変換装置は、商用電源から供給される第１の交流電力を整流するとともに、第１の交流電力の電圧を昇圧する整流昇圧部と、整流昇圧部の出力端に接続されるコンデンサと、コンデンサの両端に接続され、整流昇圧部およびコンデンサから出力される電力を第２の交流電力に変換し、モータが搭載された機器に出力するインバータと、整流昇圧部の動作を制御するとともに、整流昇圧部からコンデンサに流入する電力の脈動に応じた脈動を含む第２の交流電力をインバータから機器に出力するようにインバータの動作を制御し、コンデンサに流れる電流を抑制する制御部と、を備える。制御部は、インバータ、モータ、および機器の動作状態である負荷状態に応じて運転モードを判定する。 In order to solve the above-described problems and achieve the object, a power conversion device according to the present disclosure rectifies first AC power supplied from a commercial power supply and boosts the voltage of the first AC power. A device equipped with a booster, a capacitor connected to the output end of the rectifier booster, a motor connected to both ends of the capacitor, converting the power output from the rectifier booster and the capacitor into second AC power, and a motor and the operation of the rectifying and boosting unit, and the operation of the inverter so that the second AC power including the pulsation corresponding to the pulsation of the power flowing into the capacitor from the rectifying and boosting unit is output from the inverter to the device. and a control unit that controls the current flowing through the capacitor. The control unit determines the operation mode according to the load state, which is the operating state of the inverter, the motor, and the equipment.
　本開示に係る電力変換装置は、平滑用のコンデンサの劣化を抑制しつつ、装置の大型化を抑制できる、という効果を奏する。 The power converter according to the present disclosure has the effect of suppressing the deterioration of the smoothing capacitor and suppressing the enlargement of the device.
実施の形態１に係る電力変換装置の構成例を示す第１の図FIG. 1 is a first diagram showing a configuration example of a power converter according to Embodiment 1; 実施の形態１に係る電力変換装置の構成例を示す第２の図A second diagram showing a configuration example of the power converter according to Embodiment 1 実施の形態１に係る電力変換装置の構成例を示す第３の図A third diagram showing a configuration example of the power converter according to Embodiment 1 比較例として、平滑部で昇圧部から出力される電流を平滑化し、インバータに流れる電流を一定にした場合の各電流および平滑部のコンデンサのコンデンサ電圧の例を示す図As a comparative example, the smoothing unit smoothes the current output from the boosting unit and shows an example of each current and the capacitor voltage of the smoothing unit when the current flowing through the inverter is kept constant. 実施の形態１に係る電力変換装置の制御部がインバータの動作を制御して平滑部に流れる電流を低減したときの各電流および平滑部のコンデンサのコンデンサ電圧の例を示す図FIG. 4 is a diagram showing examples of currents and capacitor voltages of capacitors in the smoothing unit when the control unit of the power converter according to Embodiment 1 controls the operation of the inverter to reduce the current flowing in the smoothing unit; 実施の形態１に係る電力変換装置の運転モードおよび運転モードの内容を示す第１の図FIG. 1 shows operation modes of the power converter according to Embodiment 1 and the contents of the operation modes; 実施の形態１に係る電力変換装置の運転モードおよび運転モードの内容を示す第２の図A second diagram showing operation modes of the power converter according to Embodiment 1 and the contents of the operation modes 実施の形態１に係る電力変換装置が備える制御部の動作を示すフローチャート4 is a flow chart showing the operation of the control unit included in the power converter according to Embodiment 1; 実施の形態１に係る電力変換装置が備える制御部を実現するハードウェア構成の一例を示す図FIG. 2 is a diagram showing an example of a hardware configuration that realizes a control unit included in the power converter according to Embodiment 1; FIG. 実施の形態２に係る冷凍サイクル適用機器の構成例を示す図A diagram showing a configuration example of a refrigeration cycle application device according to Embodiment 2
　以下に、本開示の実施の形態に係る電力変換装置、モータ駆動装置および冷凍サイクル適用機器を図面に基づいて詳細に説明する。 A power conversion device, a motor drive device, and a refrigeration cycle application device according to an embodiment of the present disclosure will be described below in detail based on the drawings.
実施の形態１．
　図１は、実施の形態１に係る電力変換装置１の構成例を示す第１の図である。電力変換装置１は、商用電源１１０および圧縮機３１５に接続される。電力変換装置１は、商用電源１１０から供給される電源電圧Ｖｓの第１の交流電力を所望の振幅および位相を有する第２の交流電力に変換し、圧縮機３１５に供給する。電力変換装置１は、整流部１３０と、昇圧部６００と、電流検出部５０１と、平滑部２００と、電流検出部５０２と、インバータ３１０と、電流検出部３１３ａ，３１３ｂと、制御部４００と、を備える。なお、電力変換装置１では、整流部１３０、および昇圧部６００によって整流昇圧部７００を構成している。また、電力変換装置１、および圧縮機３１５が備えるモータ３１４によって、モータ駆動装置２を構成している。 Embodiment 1.
FIG. 1 is a first diagram showing a configuration example of a power conversion device 1 according to Embodiment 1. FIG. Power converter 1 is connected to commercial power source 110 and compressor 315 . Power converter 1 converts first AC power having power supply voltage Vs supplied from commercial power supply 110 into second AC power having a desired amplitude and phase, and supplies the second AC power to compressor 315 . The power converter 1 includes a rectifying section 130, a boosting section 600, a current detecting section 501, a smoothing section 200, a current detecting section 502, an inverter 310, current detecting sections 313a and 313b, a control section 400, Prepare. In the power converter 1 , the rectifying section 130 and the boosting section 600 constitute a rectifying and boosting section 700 . A motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 .
　整流部１３０は、整流素子１３１～１３４によって構成されるブリッジ回路を有し、商用電源１１０から供給される電源電圧Ｖｓの第１の交流電力を整流して出力する。整流部１３０は、全波整流を行うものである。 The rectifying section 130 has a bridge circuit composed of rectifying elements 131 to 134, rectifies the first AC power of the power supply voltage Vs supplied from the commercial power supply 110, and outputs it. The rectifier 130 performs full-wave rectification.
　昇圧部６００は、リアクトル６３１、スイッチング素子６３２、およびダイオード６３３を有する。昇圧部６００は、制御部４００の制御によって、スイッチング素子６３２をオンオフし、整流部１３０から出力された電力を昇圧し、昇圧した電力を平滑部２００に出力する。本実施の形態において、昇圧部６００は、制御部４００によって、スイッチング素子６３２が連続的にスイッチング動作を行うフルＰＡＭ（Ｐｕｌｓｅ　Ａｍｐｌｉｔｕｄｅ　Ｍｏｄｕｌａｔｉｏｎ）で制御される。電力変換装置１は、昇圧部６００によって商用電源１１０の力率改善制御を行い、平滑部２００のコンデンサ２１０のコンデンサ電圧Ｖｄｃを電源電圧Ｖｓよりも高い電圧にする。 The booster section 600 has a reactor 631 , a switching element 632 and a diode 633 . Boosting section 600 turns switching element 632 on and off under the control of control section 400 , boosts the power output from rectifying section 130 , and outputs the boosted power to smoothing section 200 . In this embodiment, the boosting unit 600 is controlled by the control unit 400 in full PAM (Pulse Amplitude Modulation) in which the switching element 632 continuously performs switching operations. The power converter 1 performs power factor improvement control of the commercial power source 110 by the step-up unit 600 to make the capacitor voltage Vdc of the capacitor 210 of the smoothing unit 200 higher than the power supply voltage Vs.
　整流昇圧部７００は、整流部１３０および昇圧部６００によって、商用電源１１０から供給される第１の交流電力を整流するとともに、商用電源１１０から供給される第１の交流電力の電圧を昇圧する。本実施の形態では、整流昇圧部７００において、整流部１３０および昇圧部６００は直列に接続されている。 Rectifying and boosting section 700 rectifies the first AC power supplied from commercial power supply 110 and boosts the voltage of the first AC power supplied from commercial power supply 110 by means of rectifying section 130 and boosting section 600 . In the present embodiment, in rectifying and boosting section 700, rectifying section 130 and boosting section 600 are connected in series.
　電流検出部５０１は、昇圧部６００によって昇圧された電力の電流値を検出し、検出した電流値を制御部４００に出力する。 The current detection unit 501 detects the current value of the power boosted by the booster unit 600 and outputs the detected current value to the control unit 400 .
　平滑部２００は、昇圧部６００の出力端に接続される。平滑部２００は、平滑素子としてコンデンサ２１０を有し、昇圧部６００によって昇圧された電力を平滑化する。コンデンサ２１０は、例えば、電解コンデンサ、フィルムコンデンサなどである。コンデンサ２１０は、整流部１３０によって整流された電力を平滑化するような容量を有し、平滑化によりコンデンサ２１０に発生する電圧は商用電源１１０の全波整流波形形状ではなく、直流成分に商用電源１１０の周波数に応じた電圧リプルが重畳した波形形状となり、大きく脈動しない。この電圧リプルの周波数は、商用電源１１０が単相の場合は電源電圧Ｖｓの周波数の２倍成分となり、商用電源１１０が三相の場合は６倍成分が主成分となる。商用電源１１０から入力される電力とインバータ３１０から出力される電力が変化しない場合、この電圧リプルの振幅はコンデンサ２１０の容量によって決まる。例えば、コンデンサ２１０に発生する電圧リプルの最大値が最小値の２倍未満となるような範囲で脈動している。 The smoothing section 200 is connected to the output terminal of the boosting section 600 . Smoothing section 200 has capacitor 210 as a smoothing element, and smoothes the power boosted by boosting section 600 . Capacitor 210 is, for example, an electrolytic capacitor, a film capacitor, or the like. Capacitor 210 has a capacity for smoothing the power rectified by rectifying section 130, and the voltage generated in capacitor 210 by the smoothing does not have the shape of a full-wave rectified waveform of commercial power supply 110, but the DC component of the commercial power supply. It has a waveform shape in which voltage ripples corresponding to the frequency of 110 are superimposed, and does not pulsate greatly. The frequency of this voltage ripple is a component twice the frequency of the power supply voltage Vs when the commercial power supply 110 is single-phase, and the main component is a frequency component six times the frequency of the power supply voltage Vs when the commercial power supply 110 is three-phase. If the power input from commercial power supply 110 and the power output from inverter 310 do not change, the amplitude of this voltage ripple is determined by the capacitance of capacitor 210 . For example, it pulsates in such a range that the maximum value of the voltage ripple generated in the capacitor 210 is less than twice the minimum value.
　電流検出部５０２は、インバータ３１０に流れる電流の電流値を検出し、検出した電流値を制御部４００に出力する。 The current detection unit 502 detects the current value of the current flowing through the inverter 310 and outputs the detected current value to the control unit 400 .
　インバータ３１０は、平滑部２００、すなわちコンデンサ２１０の両端に接続される。インバータ３１０は、スイッチング素子３１１ａ～３１１ｆ、および還流ダイオード３１２ａ～３１２ｆを有する。インバータ３１０は、制御部４００の制御によってスイッチング素子３１１ａ～３１１ｆをオンオフし、整流昇圧部７００および平滑部２００から出力される電力を所望の振幅および位相を有する第２の交流電力に変換して、モータ３１４が搭載された機器である圧縮機３１５に出力する。電流検出部３１３ａ，３１３ｂは、各々、インバータ３１０から出力される３相の電流のうち１相の電流値を検出し、検出した電流値を制御部４００に出力する。なお、制御部４００は、インバータ３１０から出力される３相の電流値のうち２相の電流値を取得することで、インバータ３１０から出力される残りの１相の電流値を算出することができる。圧縮機３１５は、圧縮機駆動用のモータ３１４を有する負荷である。モータ３１４は、インバータ３１０から供給される第２の交流電力の振幅および位相に応じて回転し、圧縮動作を行う。例えば、圧縮機３１５が空気調和機などで使用される密閉型圧縮機の場合、圧縮機３１５の負荷トルクは定トルク負荷とみなせる場合が多い。モータ３１４について、図１ではモータ巻線がＹ結線の場合を示しているが、一例であり、これに限定されない。モータ３１４のモータ巻線は、Δ結線であってもよいし、Ｙ結線とΔ結線とが切り替え可能な仕様であってもよい。 The inverter 310 is connected to both ends of the smoothing section 200 , that is, the capacitor 210 . Inverter 310 has switching elements 311a-311f and freewheeling diodes 312a-312f. Inverter 310 turns on and off switching elements 311a to 311f under the control of control unit 400, converts the power output from rectifying/boosting unit 700 and smoothing unit 200 into second AC power having desired amplitude and phase, The power is output to a compressor 315, which is a device on which a motor 314 is mounted. Current detection units 313 a and 313 b each detect a current value of one phase out of three-phase currents output from inverter 310 and output the detected current value to control unit 400 . Control unit 400 acquires two-phase current values among the three-phase current values output from inverter 310, thereby calculating the remaining one-phase current value output from inverter 310. . Compressor 315 is a load having a motor 314 for driving the compressor. Motor 314 rotates according to the amplitude and phase of the second AC power supplied from inverter 310 to perform compression operation. For example, when the compressor 315 is a hermetic compressor used in an air conditioner or the like, the load torque of the compressor 315 can often be regarded as a constant torque load. As for the motor 314, FIG. 1 shows a case where the motor windings are Y-connected, but this is only an example and the present invention is not limited to this. The motor windings of the motor 314 may be delta-connection, or may be switchable between Y-connection and delta-connection.
　なお、電力変換装置１において、図１に示す各部の構成および配置は一例であり、各部の構成および配置は図１で示される例に限定されない。例えば、整流昇圧部７００は、４つのスイッチング素子を備え、制御部４００の制御によって４つのスイッチング素子をオンオフし、商用電源１１０から出力された第１の交流電力を整流するとともに昇圧し、昇圧した電力を平滑部２００に出力してもよい。また、整流昇圧部７００は、整流部１３０に対して昇圧部が並列に接続されるような構成であってもよい。 In addition, in the power converter 1, the configuration and arrangement of each part shown in FIG. 1 are examples, and the configuration and arrangement of each part are not limited to the example shown in FIG. For example, the rectifying and boosting unit 700 includes four switching elements, and turns on and off the four switching elements under the control of the control unit 400 to rectify and boost the first AC power output from the commercial power supply 110. Power may be output to smoothing section 200 . Further, the rectifying/boosting section 700 may be configured such that the boosting section is connected in parallel with the rectifying section 130 .
　図２は、実施の形態１に係る電力変換装置１の構成例を示す第２の図である。電力変換装置１は、図１に示す電力変換装置１に対して、整流昇圧部７００を整流昇圧部７０１に置き換えたものである。なお、電力変換装置１、および圧縮機３１５が備えるモータ３１４によって、モータ駆動装置２を構成している。整流昇圧部７０１は、リアクトル６３１、スイッチング素子６１１～６１４、および各々がスイッチング素子６１１～６１４のうちの１つに並列に接続される整流素子６２１～６２４を有する。また、本構成のリアクトル６３１は、商用電源１１０と整流昇圧部７０１との片側接続線のみに挿入されているが、両側接続線に挿入されていてもよい。整流昇圧部７０１は、制御部４００の制御によって、スイッチング素子６１１～６１４をオンオフし、商用電源１１０から出力された第１の交流電力を整流するとともに昇圧し、昇圧した電力を平滑部２００に出力する。整流昇圧部７０１は、制御部４００によって、スイッチング素子６１１～６１４が連続的にスイッチング動作を行うフルＰＡＭで制御される。 FIG. 2 is a second diagram showing a configuration example of the power converter 1 according to the first embodiment. The power conversion device 1 is obtained by replacing the rectification/boost section 700 with a rectification/boost section 701 in the power conversion device 1 shown in FIG. A motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 . Rectifying and boosting section 701 has a reactor 631, switching elements 611-614, and rectifying elements 621-624 each connected in parallel to one of switching elements 611-614. In addition, although the reactor 631 of this configuration is inserted only in the one-side connection line between the commercial power source 110 and the rectifying/boosting section 701, it may be inserted in the both-side connection line. Rectifying and boosting section 701 turns switching elements 611 to 614 on and off under the control of control section 400, rectifies and boosts the first AC power output from commercial power supply 110, and outputs the boosted power to smoothing section 200. do. The rectifying/boosting unit 701 is controlled by the control unit 400 in full PAM, in which the switching elements 611 to 614 continuously perform switching operations.
　図３は、実施の形態１に係る電力変換装置１の構成例を示す第３の図である。電力変換装置１は、図１に示す電力変換装置１に対して、整流昇圧部７００を整流昇圧部７０２に置き換えたものである。なお、電力変換装置１、および圧縮機３１５が備えるモータ３１４によって、モータ駆動装置２を構成している。整流昇圧部７０２は、リアクトル１２０、整流部１３０、および昇圧部６０１を有する。図１に示す電力変換装置１において、昇圧部６００は、整流部１３０の後段、すなわち電力変換装置１の内部で整流部１３０と直列に接続されていたが、昇圧部６０１は、電力変換装置１の内部で整流部１３０と並列に接続されている。昇圧部６０１は、整流素子６２１～６２４、およびスイッチング素子６１１を有する。昇圧部６０１は、制御部４００の制御によって、スイッチング素子６１１をオンオフし、商用電源１１０から出力された第１の交流電力を昇圧し、昇圧した電力を整流部１３０に出力する。整流昇圧部７０２の昇圧部６０１は、制御部４００の制御によって、商用電源１１０から供給される第１の交流電力の周波数の半周期に１回または複数回、スイッチング素子６１１のスイッチング動作を行う簡易スイッチングで制御される。 FIG. 3 is a third diagram showing a configuration example of the power converter 1 according to the first embodiment. The power conversion device 1 is obtained by replacing the rectification/boost section 700 with a rectification/boost section 702 in the power conversion device 1 shown in FIG. A motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 . Rectifying and boosting section 702 has reactor 120 , rectifying section 130 , and boosting section 601 . In the power conversion device 1 shown in FIG. is connected in parallel with the rectifying section 130 inside the . Boosting section 601 has rectifying elements 621 to 624 and switching element 611 . Boosting section 601 turns switching element 611 on and off under the control of control section 400 , boosts the first AC power output from commercial power supply 110 , and outputs the boosted power to rectifying section 130 . The boosting unit 601 of the rectifying boosting unit 702 is controlled by the control unit 400 to perform the switching operation of the switching element 611 once or a plurality of times per half cycle of the frequency of the first AC power supplied from the commercial power supply 110 . Controlled by switching.
　以降では、特に断らない限り、図１に示す電力変換装置１を例にして説明する。また、以降の説明において、電流検出部５０１，５０２，３１３ａ，３１３ｂをまとめて検出部と称することがある。また、電流検出部５０１，５０２，３１３ａ，３１３ｂで検出された電流値を検出値と称することがある。電力変換装置１は、前述の検出部以外の検出部を備えていてもよい。図１では省略しているが、電力変換装置１は、一般的にコンデンサ電圧Ｖｄｃを検出する検出部を備えている。電力変換装置１は、商用電源１１０から供給される第１の交流電力の電圧、電流などを検出する検出部を備えていてもよい。 Hereinafter, unless otherwise specified, the power converter 1 shown in FIG. 1 will be used as an example. Also, in the following description, the current detection units 501, 502, 313a, and 313b may be collectively referred to as a detection unit. Also, the current values detected by the current detection units 501, 502, 313a, and 313b may be referred to as detection values. The power electronics device 1 may include a detector other than the detector described above. Although omitted in FIG. 1, the power conversion device 1 generally includes a detection unit that detects the capacitor voltage Vdc. The power conversion device 1 may include a detection unit that detects the voltage, current, and the like of the first AC power supplied from the commercial power source 110 .
　制御部４００は、電流検出部５０１から昇圧部６００によって昇圧された電力の電流値を取得し、電流検出部５０２からインバータ３１０に流れる電流の電流値を取得し、電流検出部３１３ａ，３１３ｂからインバータ３１０によって変換された所望の振幅および位相を有する第２の交流電力の電流値を取得する。制御部４００は、各検出部によって検出された検出値を用いて、整流昇圧部７００の昇圧部６００の動作、具体的には、昇圧部６００が有するスイッチング素子６３２のオンオフを制御する。また、制御部４００は、各検出部によって検出された検出値を用いて、インバータ３１０の動作、具体的には、インバータ３１０が有するスイッチング素子３１１ａ～３１１ｆのオンオフを制御する。本実施の形態において、制御部４００は、整流昇圧部７００の動作を制御する。制御部４００は、整流昇圧部７００の動作を制御し、商用電源１１０から供給される第１の交流電力の力率改善制御、および平滑部２００のコンデンサ２１０の平均電圧制御を行う。また、制御部４００は、整流昇圧部７００から平滑部２００のコンデンサ２１０に流入する電力の脈動に応じた脈動を含む第２の交流電力をインバータ３１０から負荷である圧縮機３１５に出力するようにインバータ３１０の動作を制御する。平滑部２００のコンデンサ２１０に流入する電力の脈動に応じた脈動とは、例えば、平滑部２００のコンデンサ２１０に流入する電力の脈動の周波数などによって変動する脈動である。これにより、制御部４００は、平滑部２００のコンデンサ２１０に流れる電流を抑制する。なお、制御部４００は、各検出部から取得した全ての検出値を用いなくてもよく、一部の検出値を用いて制御を行ってもよい。 The control unit 400 acquires the current value of the power boosted by the boosting unit 600 from the current detection unit 501, acquires the current value of the current flowing through the inverter 310 from the current detection unit 502, and acquires the current value of the current flowing through the inverter 310 from the current detection units 313a and 313b. Obtain the current value of the second AC power having the desired amplitude and phase converted by 310 . The control unit 400 controls the operation of the boosting unit 600 of the rectifying/boosting unit 700, specifically, the switching element 632 included in the boosting unit 600, by using the detection values detected by the respective detection units. Further, the control unit 400 controls the operation of the inverter 310, specifically, ON/OFF of the switching elements 311a to 311f included in the inverter 310, using the detection values detected by the respective detection units. In this embodiment, the control unit 400 controls the operation of the rectifying/boosting unit 700 . Control unit 400 controls the operation of rectifying and boosting unit 700 , performs power factor improvement control of the first AC power supplied from commercial power supply 110 , and average voltage control of capacitor 210 of smoothing unit 200 . In addition, control unit 400 causes inverter 310 to output second AC power including pulsation corresponding to the pulsation of power flowing into capacitor 210 of smoothing unit 200 from rectifying and boosting unit 700 to compressor 315 as a load. It controls the operation of inverter 310 . The pulsation corresponding to the pulsation of the power flowing into the capacitor 210 of the smoothing section 200 is, for example, the pulsation that varies depending on the frequency of the pulsation of the power flowing into the capacitor 210 of the smoothing section 200 . Thereby, the control unit 400 suppresses the current flowing through the capacitor 210 of the smoothing unit 200 . Note that the control unit 400 does not have to use all the detection values acquired from each detection unit, and may perform control using some of the detection values.
　つづいて、電力変換装置１が備える制御部４００の動作について説明する。本実施の形態では、電力変換装置１において、インバータ３１０および圧縮機３１５によって発生する負荷が一定の負荷とみなすことができ、平滑部２００から出力される電流で見た場合、平滑部２００に定電流負荷が接続されているものとして、以降の説明を行う。ここで、図１に示すように、昇圧部６００から流れる電流を電流Ｉ１とし、インバータ３１０に流れる電流を電流Ｉ２とし、平滑部２００から流れる電流を電流Ｉ３とする。電流Ｉ２は、電流Ｉ１と電流Ｉ３とを併せた電流となる。電流Ｉ３は、電流Ｉ２と電流Ｉ１との差分、すなわち電流Ｉ２－電流Ｉ１として表すことができる。電流Ｉ３は、平滑部２００の放電方向を正方向とし、平滑部２００の充電方向を負方向とする。すなわち、平滑部２００には、電流が流入することもあり、電流が流出することもある。 Next, the operation of the control unit 400 included in the power converter 1 will be described. In the present embodiment, in power converter 1, the load generated by inverter 310 and compressor 315 can be regarded as a constant load. The following description assumes that a current load is connected. Here, as shown in FIG. 1, the current flowing from boosting section 600 is current I1, the current flowing to inverter 310 is current I2, and the current flowing from smoothing section 200 is current I3. The current I2 is the sum of the currents I1 and I3. Current I3 can be expressed as the difference between currents I2 and I1, ie current I2-current I1. The current I3 has a positive direction in the discharging direction of the smoothing section 200 and a negative direction in the charging direction of the smoothing section 200 . That is, current may flow into or out of the smoothing section 200 .
　図４は、比較例として、平滑部２００で昇圧部６００から出力される電流を平滑化し、インバータ３１０に流れる電流Ｉ２を一定にした場合の各電流Ｉ１～Ｉ３および平滑部２００のコンデンサ２１０のコンデンサ電圧Ｖｄｃの例を示す図である。上から順に、電流Ｉ１、電流Ｉ２、電流Ｉ３、および電流Ｉ３に応じて発生するコンデンサ２１０のコンデンサ電圧Ｖｄｃを示している。電流Ｉ１，Ｉ２，Ｉ３の縦軸は電流値を示し、コンデンサ電圧Ｖｄｃの縦軸は電圧値を示している。横軸は全て時間ｔを示している。なお、電流Ｉ２，Ｉ３には、実際にはインバータ３１０のキャリア成分が重畳されるが、ここでは省略する。以降についても同様とする。図４に示すように、電力変換装置１において、仮に、昇圧部６００から流れる電流Ｉ１が平滑部２００によって十分に平滑化された場合、インバータ３１０に流れる電流Ｉ２は一定の電流値となる。しかしながら、平滑部２００のコンデンサ２１０には、大きな電流Ｉ３が流れ、劣化の要因となる。そのため、本実施の形態では、電力変換装置１において、制御部４００は、平滑部２００に流れる電流Ｉ３を低減するように、インバータ３１０に流れる電流Ｉ２を制御、すなわちインバータ３１０の動作を制御する。 FIG. 4 shows, as a comparative example, currents I1 to I3 and the capacitor 210 of the smoothing unit 200 when the current output from the boosting unit 600 is smoothed by the smoothing unit 200 and the current I2 flowing through the inverter 310 is kept constant. FIG. 4 is a diagram showing an example of voltage Vdc; From the top, current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown. The vertical axis of currents I1, I2, and I3 indicates current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t. Although the currents I2 and I3 are actually superimposed with the carrier component of the inverter 310, they are omitted here. The same shall apply to the following. As shown in FIG. 4, in the power conversion device 1, if the current I1 flowing from the boosting unit 600 is sufficiently smoothed by the smoothing unit 200, the current I2 flowing through the inverter 310 has a constant current value. However, a large current I3 flows through the capacitor 210 of the smoothing section 200, which causes deterioration. Therefore, in the present embodiment, in power converter 1, control unit 400 controls current I2 flowing through inverter 310, that is, controls the operation of inverter 310, so as to reduce current I3 flowing through smoothing unit 200. FIG.
　図５は、実施の形態１に係る電力変換装置１の制御部４００がインバータ３１０の動作を制御して平滑部２００に流れる電流Ｉ３を低減したときの各電流Ｉ１～Ｉ３および平滑部２００のコンデンサ２１０のコンデンサ電圧Ｖｄｃの例を示す図である。上から順に、電流Ｉ１、電流Ｉ２、電流Ｉ３、および電流Ｉ３に応じて発生するコンデンサ２１０のコンデンサ電圧Ｖｄｃを示している。電流Ｉ１，Ｉ２，Ｉ３の縦軸は電流値を示し、コンデンサ電圧Ｖｄｃの縦軸は電圧値を示している。横軸は全て時間ｔを示している。電力変換装置１の制御部４００は、図５に示すような電流Ｉ２がインバータ３１０に流れるようにインバータ３１０の動作を制御することによって、図４の例と比較して、昇圧部６００から平滑部２００に流れ込む電流の周波数成分を低減し、平滑部２００に流れる電流Ｉ３を低減することができる。具体的には、制御部４００は、電流Ｉ１の周波数成分を主成分とした脈動電流を含む電流Ｉ２がインバータ３１０に流れるようにインバータ３１０の動作を制御する。 FIG. 5 shows the respective currents I1 to I3 and the capacitor of the smoothing unit 200 when the control unit 400 of the power converter 1 according to Embodiment 1 controls the operation of the inverter 310 to reduce the current I3 flowing through the smoothing unit 200. 210 is a diagram showing an example of the capacitor voltage Vdc of 210. FIG. From the top, current I1, current I2, current I3, and capacitor voltage Vdc of capacitor 210 generated in response to current I3 are shown. The vertical axis of currents I1, I2, and I3 indicates current values, and the vertical axis of capacitor voltage Vdc indicates voltage values. All horizontal axes indicate time t. The control unit 400 of the power conversion device 1 controls the operation of the inverter 310 so that the current I2 shown in FIG. The frequency component of the current flowing into the smoothing section 200 can be reduced, and the current I3 flowing into the smoothing section 200 can be reduced. Specifically, control unit 400 controls the operation of inverter 310 so that current I2 containing a pulsating current whose main component is the frequency component of current I1 flows through inverter 310 .
　電流Ｉ１の周波数成分は、商用電源１１０から供給される交流電流の周波数、整流部１３０の構成、および昇圧部６００のスイッチング素子６３２のスイッチング速度によって決定される。そのため、制御部４００は、電流Ｉ２に重畳する脈動電流の周波数成分を、予め定めた振幅および位相を有する成分とすることができる。電流Ｉ２に重畳される脈動電流の周波数成分は、電流Ｉ１の周波数成分の相似波形となる。制御部４００は、電流Ｉ２に重畳する脈動電流の周波数成分を電流Ｉ１の周波数成分に近付けていくに連れて、平滑部２００に流れる電流Ｉ３を低減し、コンデンサ電圧Ｖｄｃに発生する脈動電圧を低減することができる。 The frequency component of the current I1 is determined by the frequency of the alternating current supplied from the commercial power supply 110, the configuration of the rectifying section 130, and the switching speed of the switching element 632 of the boosting section 600. Therefore, control unit 400 can make the frequency component of the pulsating current superimposed on current I2 a component having a predetermined amplitude and phase. The frequency component of the pulsating current superimposed on the current I2 has a waveform similar to that of the current I1. As the frequency component of the pulsating current superimposed on the current I2 approaches the frequency component of the current I1, the control unit 400 reduces the current I3 flowing through the smoothing unit 200 and reduces the pulsating voltage generated in the capacitor voltage Vdc. can do.
　制御部４００が、インバータ３１０の動作を制御することによってインバータ３１０に流れる電流の脈動を制御することは、インバータ３１０から圧縮機３１５に出力される第２の交流電力の脈動を制御することと同じである。制御部４００は、インバータ３１０から出力される第２の交流電力に含まれる脈動が、整流昇圧部７００から出力される電力の脈動よりも小さくなるようにインバータ３１０の動作を制御する。制御部４００は、コンデンサ電圧Ｖｄｃの電圧リプル、すなわちコンデンサ２１０に発生する電圧リプルが、インバータ３１０から出力される第２の交流電力にコンデンサ２１０に流入する電力の脈動に応じた脈動が含まれないときのコンデンサ２１０に発生する電圧リプルよりも小さくなるように、インバータ３１０から出力される第２の交流電力に含まれる脈動の振幅および位相を制御する。インバータ３１０から出力される第２の交流電力にコンデンサ２１０に流入する電力の脈動に応じた脈動が含まれないときとは、図４に示すような制御のことである。 Controlling the pulsation of the current flowing through the inverter 310 by controlling the operation of the inverter 310 by the control unit 400 is the same as controlling the pulsation of the second AC power output from the inverter 310 to the compressor 315. is. Control unit 400 controls the operation of inverter 310 so that the pulsation contained in the second AC power output from inverter 310 is smaller than the pulsation of the power output from rectifying and boosting unit 700 . Control unit 400 controls that the voltage ripple of capacitor voltage Vdc, that is, the voltage ripple generated in capacitor 210 does not include pulsation corresponding to the pulsation of the power flowing into capacitor 210 in the second AC power output from inverter 310. The amplitude and phase of the pulsation contained in the second AC power output from inverter 310 are controlled so as to be smaller than the voltage ripple generated in capacitor 210 when the voltage is high. When the second AC power output from inverter 310 does not include pulsation corresponding to the pulsation of the power flowing into capacitor 210, it means control as shown in FIG.
　なお、商用電源１１０から供給される交流電流については、特に限定されず、単相であってもよいし、３相であってもよい。制御部４００は、電流Ｉ２に重畳する脈動電流の周波数成分について、商用電源１１０から供給される第１の交流電力に応じて決定すればよい。具体的には、制御部４００は、インバータ３１０に流れる電流Ｉ２の脈動波形を、商用電源１１０から供給される第１の交流電力が単相の場合は第１の交流電力の周波数の２倍の周波数成分、または商用電源１１０から供給される第１の交流電力が３相の場合は第１の交流電力の周波数の６倍の周波数成分を主成分とする脈動波形に直流分を加算した形状に制御する。脈動波形は、例えば、正弦波の絶対値の形状、または正弦波の形状とする。この場合、制御部４００は、正弦波の周波数の整数倍の成分のうち少なくとも１つの周波数成分を予め規定された振幅として脈動波形に加算してもよい。また、脈動波形は、矩形波の形状、または三角波の形状であってもよい。この場合、制御部４００は、脈動波形の振幅および位相を予め規定された値としてもよい。 The alternating current supplied from the commercial power supply 110 is not particularly limited, and may be single-phase or three-phase. Control unit 400 may determine the frequency component of the pulsating current superimposed on current I2 according to the first AC power supplied from commercial power supply 110 . Specifically, when the first AC power supplied from commercial power supply 110 is single-phase, control unit 400 sets the pulsating waveform of current I2 flowing in inverter 310 to twice the frequency of the first AC power. In the case where the first AC power supplied from the commercial power supply 110 is three-phase, the pulsation waveform having the frequency component six times the frequency of the first AC power as the main component is added with the DC component. Control. The pulsation waveform is, for example, the shape of the absolute value of a sine wave or the shape of a sine wave. In this case, the control unit 400 may add at least one frequency component of integral multiples of the sine wave frequency to the pulsating waveform as a predetermined amplitude. Also, the pulsating waveform may be in the shape of a rectangular wave or in the shape of a triangular wave. In this case, control unit 400 may set the amplitude and phase of the pulsation waveform to predetermined values.
　制御部４００は、コンデンサ２１０にかかる電圧またはコンデンサ２１０に流れる電流を用いて、インバータ３１０から出力される第２の交流電力に含まれる脈動の脈動量を演算してもよいし、商用電源１１０から供給される第１の交流電力の電圧または電流を用いて、インバータ３１０から出力される第２の交流電力に含まれる脈動の脈動量を演算してもよい。 Control unit 400 may use the voltage applied to capacitor 210 or the current flowing through capacitor 210 to calculate the amount of pulsation included in the second AC power output from inverter 310 , or The voltage or current of the supplied first AC power may be used to calculate the amount of pulsation included in the second AC power output from inverter 310 .
　また、制御部４００は、商用電源１１０から供給される第１の交流電力の周波数成分と異なる周波数成分を含む第２の交流電力をインバータ３１０から圧縮機３１５に出力させるようにインバータ３１０を制御する場合、インバータ３１０から圧縮機３１５に出力される第２の交流電力に含まれる周波数成分を、昇圧部６００のスイッチング素子６３２をオンオフするための駆動信号に重畳させてもよい。すなわち、制御部４００は、インバータ３１０から圧縮機３１５に出力する第２の交流電力の電力脈動のうち、商用電源１１０から供給される第１の交流電力が単相の場合は第１の交流電力の周波数の２倍の周波数成分、または商用電源１１０から供給される第１の交流電力が３相の場合は第１の交流電力の周波数の６倍の周波数成分以外の変動周波数成分を含む電力が整流昇圧部７００から出力されるように、整流昇圧部７００の動作、具体的には、昇圧部６００のスイッチング素子６３２の動作を制御する。制御部４００は、変動周波数成分を、商用電源１１０に対する指令値を用いて制御してもよいし、変動周波数成分を、商用電源１１０から供給される第１の交流電力の周波数の４０次までの整数倍の成分としない、または規定された値、例えば、所望の規格値以下になるように制御してもよい。 Further, control unit 400 controls inverter 310 so that second AC power including frequency components different from the frequency components of first AC power supplied from commercial power supply 110 is output from inverter 310 to compressor 315 . In this case, the frequency component included in the second AC power output from inverter 310 to compressor 315 may be superimposed on the driving signal for turning on/off switching element 632 of booster 600 . That is, when the first AC power supplied from the commercial power source 110 is single-phase among the power pulsations of the second AC power output from the inverter 310 to the compressor 315, the control unit 400 controls the first AC power or, if the first AC power supplied from the commercial power supply 110 is three-phase, the power containing a fluctuating frequency component other than the frequency component six times the frequency of the first AC power. The operation of the rectifying/boosting section 700 , specifically, the operation of the switching element 632 of the boosting section 600 is controlled so as to output from the rectifying/boosting section 700 . Control unit 400 may control the fluctuating frequency component using a command value for commercial power supply 110, or may control the fluctuating frequency component to the 40th order of the frequency of the first AC power supplied from commercial power supply 110. It may be controlled so as not to be an integral multiple component, or to be a specified value, for example, a desired standard value or less.
　つぎに、電力変換装置１が冷凍サイクル適用機器に搭載された場合における、電力変換装置１の動作について説明する。例えば、電力変換装置１が冷凍サイクル適用機器である空気調和機に搭載された場合、電力変換装置１の運転モードは、空気調和機の動作状態によって大きく変化する。例えば、空気調和機が空調制御対象とする室内において、ユーザの設定温度、すなわちユーザの所望温度と現在の室内温度との温度差が大きい場合、空気調和機に搭載された電力変換装置１の負荷は大きくなる。一方、ユーザの所望温度と現在の室内温度との温度差が小さい場合、空気調和機に搭載された電力変換装置１の負荷は小さくなる。また、空気調和機の運転状態によって平滑部２００に流れる電流Ｉ３が十分小さい場合、制御部４００は、前述のような、平滑部２００に流れる電流Ｉ３を低減し、コンデンサ電圧Ｖｄｃに発生する脈動電圧を低減する制御を敢えて行わなくてもよいことも考えられる。そのため、電力変換装置１において、制御部４００は、負荷の動作状態である負荷状態に応じて前述した各種の制御を行い、運転モードを判定する。負荷とは、インバータ３１０、モータ３１４、およびモータ３１４が搭載された機器である。モータ３１４が搭載された機器とは、例えば、前述の圧縮機３１５、空気調和機に搭載されたファンなどであるが、これらに限定されない。 Next, the operation of the power converter 1 when the power converter 1 is mounted on a refrigeration cycle application device will be described. For example, when the power conversion device 1 is installed in an air conditioner, which is a refrigerating cycle device, the operation mode of the power conversion device 1 greatly changes depending on the operating state of the air conditioner. For example, in a room to be air-conditioned by the air conditioner, if the temperature difference between the user's set temperature, that is, the user's desired temperature and the current room temperature is large, the load of the power converter 1 mounted on the air conditioner becomes larger. On the other hand, when the temperature difference between the user's desired temperature and the current room temperature is small, the load on the power conversion device 1 mounted on the air conditioner is small. Further, when the current I3 flowing through the smoothing unit 200 is sufficiently small depending on the operating state of the air conditioner, the control unit 400 reduces the current I3 flowing through the smoothing unit 200 as described above, and reduces the pulsating voltage generated in the capacitor voltage Vdc. It is conceivable that it is not necessary to dare to reduce the control. Therefore, in the power conversion device 1, the control unit 400 performs the various controls described above according to the load state, which is the operating state of the load, and determines the operation mode. The load is the inverter 310, the motor 314, and the device on which the motor 314 is mounted. The device equipped with the motor 314 is, for example, the aforementioned compressor 315, the fan installed in the air conditioner, or the like, but is not limited to these.
　図６は、実施の形態１に係る電力変換装置１の運転モードおよび運転モードの内容を示す第１の図である。図７は、実施の形態１に係る電力変換装置１の運転モードおよび運転モードの内容を示す第２の図である。図６は電力変換装置１において昇圧部６００の昇圧動作オフの場合の運転モードを示す図であり、図７は電力変換装置１において昇圧部６００の昇圧動作オンの場合の運転モードを示す図である。 FIG. 6 is a first diagram showing operation modes of the power converter 1 according to Embodiment 1 and the contents of the operation modes. FIG. 7 is a second diagram showing operation modes of the power converter 1 according to Embodiment 1 and the contents of the operation modes. 6 is a diagram showing an operation mode when the boosting operation of the boosting unit 600 is off in the power conversion device 1, and FIG. 7 is a diagram showing an operation mode when the boosting operation of the boosting unit 600 is on in the power converter 1. be.
　昇圧動作は、高回転によるモータ３１４の駆動範囲を確保するため、昇圧部６００が商用電源１１０から供給される電源電圧Ｖｓを昇圧させる動作である。具体的には、制御部４００が、昇圧部６００のスイッチング素子６３２のオンオフを制御する。 The step-up operation is an operation in which the step-up section 600 steps up the power supply voltage Vs supplied from the commercial power source 110 in order to ensure the drive range of the motor 314 due to high rotation. Specifically, the control unit 400 controls on/off of the switching element 632 of the boosting unit 600 .
　振動抑制制御は、モータ３１４の１回転中における圧縮機３１５などの機械的な機構に起因する負荷トルク変動によって振動が発生する場合に、インバータ３１０から与えるトルクを負荷トルク変動に合わせることで振動を抑制する制御である。 Vibration suppression control suppresses vibration by adjusting the torque applied from inverter 310 to the load torque fluctuation when vibration occurs due to load torque fluctuation caused by a mechanical mechanism such as compressor 315 during one rotation of motor 314 . It is control to suppress.
　過変調制御は、モータ３１４を高回転領域で駆動可能とする駆動のため、インバータ３１０の出力電圧を大きくする制御である。電力変換装置１は、商用電源１１０を利用する場合、供給電圧に限りがある。そのため、電力変換装置１は、モータ３１４を高速回転する場合、供給電圧よりもモータ３１４の起電力が大きくなり回転が困難となるため、インバータ３１０からの出力電圧を歪ませて、具体的には３次の高調波成分を含めることで出力電圧の基本波成分を少し持ち上げる。これにより、電力変換装置１は、モータ３１４の高回転領域を増やすことができる。 The overmodulation control is a control that increases the output voltage of the inverter 310 in order to drive the motor 314 in a high speed range. When using the commercial power supply 110, the power converter 1 has a limited supply voltage. Therefore, when the power converter 1 rotates the motor 314 at a high speed, the electromotive force of the motor 314 becomes larger than the supply voltage, making it difficult to rotate. By including the third harmonic component, the fundamental wave component of the output voltage is slightly raised. As a result, the power conversion device 1 can increase the high rotation region of the motor 314 .
　定トルク制御は、インバータ３１０からモータ３１４に与えるトルクを一定とする制御である。定トルク制御は、定電流制御とも呼ばれる。負荷トルク変動を有するシステムであっても、比較的負荷が軽い領域で運転する場合にはそれほど振動量は大きくない。そのため、インバータ３１０から与えるトルクを一定とすることで、モータ３１４の電流波形が正弦波状、すなわち脈動を有さない波形となり、高効率運転ができる。なお、高負荷領域であっても振動が許容できる場合には、定トルク制御を使用可能である。 Constant torque control is control that keeps the torque given to the motor 314 from the inverter 310 constant. Constant torque control is also called constant current control. Even in a system with load torque fluctuations, the amount of vibration is not so large when operating in a relatively light load region. Therefore, by keeping the torque applied from the inverter 310 constant, the current waveform of the motor 314 becomes a sinusoidal waveform, that is, a waveform without pulsation, and high-efficiency operation can be performed. Constant torque control can be used when vibration is acceptable even in the high load region.
　電源脈動補償制御は、前述のように平滑部２００のコンデンサ２１０に流れる電源脈動に起因するリプル電流を抑制する制御である。電源脈動に起因するリプル電流はコンデンサ２１０をスルーし、負荷に電力を伝達することで、コンデンサ２１０のストレスを軽減することができる。 Power supply ripple compensation control is control to suppress ripple current caused by power supply ripple flowing through capacitor 210 of smoothing section 200 as described above. Ripple current caused by power supply pulsation passes through the capacitor 210 and transmits power to the load, thereby reducing stress on the capacitor 210 .
　運転モードは、整流昇圧部７００の動作、モータ３１４またはモータ３１４が搭載された機器の振動を低減する振動抑制制御、インバータ３１０の過変調制御、モータ３１４に対する定トルク制御、およびコンデンサ２１０の充放電電流を抑制する電源脈動補償制御、の各有無の組み合わせである。図６および図７に示す各制御の有無については、制御部４００が、負荷状態に応じて判定する。すなわち、制御部４００は、負荷状態に応じて、各制御の有無を判定し、運転モードを維持または切り替える。なお、図６および図７の例では、運転モードの具体的な内容として５つの項目を挙げたが、一例であり、これらに限定されない。５つの項目のうち一部の項目を制御の対象にしてもよいし、５つの項目以外の項目をさらに制御の対象にしてもよい。５つの項目以外の項目とは、例えば、弱め磁束制御がある。すなわち、運転モードには、弱め磁束制御が含まれてもよい。弱め磁束制御は、モータ３１４に負のｄ軸電流を与えて見かけ上の起電力を小さくすることで、モータ３１４の高回転領域を広げる制御である。本制御は、過変調制御同様モータ電圧飽和対策として用いるものであり、過変調制御と組み合わせる等で用いられる。 The operation modes include the operation of the rectifying and boosting unit 700, vibration suppression control for reducing vibration of the motor 314 or the equipment on which the motor 314 is mounted, overmodulation control of the inverter 310, constant torque control of the motor 314, and charge/discharge of the capacitor 210. It is a combination of presence/absence of power supply pulsation compensation control for suppressing current. Control unit 400 determines whether or not each control shown in FIGS. 6 and 7 is performed according to the load state. That is, the control unit 400 determines the presence or absence of each control according to the load state, and maintains or switches the operation mode. In addition, in the example of FIG.6 and FIG.7, although five items were mentioned as the specific content of the operation mode, it is an example and is not limited to these. Some of the five items may be controlled, or items other than the five items may be controlled. Items other than the five items include, for example, flux-weakening control. That is, the operating mode may include flux-weakening control. The flux-weakening control is a control that widens the high rotation range of the motor 314 by applying a negative d-axis current to the motor 314 to reduce the apparent electromotive force. This control, like the overmodulation control, is used as a countermeasure against motor voltage saturation, and is used in combination with the overmodulation control.
　電力変換装置１は、負荷状態について、電流値、例えば、電流検出部５０１の検出値によって電流Ｉ１を検出し、電流検出部５０２の検出値によって電流Ｉ２を検出することができる。また、電力変換装置１は、負荷状態について、温度、例えば、空気調和機に搭載される場合、空気調和機が備える室内機の温度センサの検出値、室外機の温度センサの検出値などによって温度を検出することができる。なお、電力変換装置１は、インバータ３１０の基板周辺に温度センサを備えてインバータ３１０の基板周辺の温度を検出してもよいし、モータ３１４の周辺に温度センサを備えてモータ３１４の周辺の温度を検出してもよい。また、電力変換装置１は、負荷状態について、運転速度、例えば、圧縮機３１５のモータ３１４、空気調和機に搭載される図示しないファンなどの運転速度を、制御部４００の制御の過程で生成される指令値、または制御部４００の制御の過程で運転周波数から推定される推定値などから直接的、または間接的に検出することができる。このように、負荷状態は、インバータ３１０またはモータ３１４または圧縮機３１５を検出対象とした物理量を検出する検出部の検出値、制御部４００の制御過程で生成される指令値、および制御部４００の制御過程で推定される推定値のうち少なくとも１つによって得られる。物理量は、前述の電流値、温度の他、例えば、電圧値、運転速度などであってもよい。すなわち、物理量に電流、電圧、温度、運転速度のうち少なくとも１つが含まれる。 The power converter 1 can detect the current I1 based on the current value, for example, the value detected by the current detection unit 501, and the current I2 based on the value detected by the current detection unit 502. In addition, the power conversion device 1 determines the load state based on the temperature, for example, the detected value of the temperature sensor of the indoor unit provided in the air conditioner, the detected value of the temperature sensor of the outdoor unit, etc. when installed in the air conditioner. can be detected. The power conversion device 1 may include a temperature sensor around the substrate of the inverter 310 to detect the temperature around the substrate of the inverter 310 , or may include a temperature sensor around the motor 314 to detect the temperature around the motor 314 . may be detected. In addition, the power converter 1 generates the operating speed, for example, the operating speed of the motor 314 of the compressor 315, the fan (not shown) mounted on the air conditioner, etc. in the process of control by the control unit 400 for the load state. It can be directly or indirectly detected from a command value to be applied or an estimated value estimated from the operating frequency in the process of control by the control unit 400 . In this way, the load state includes the detection value of the detection unit that detects the physical quantity of the inverter 310, the motor 314, or the compressor 315, the command value generated in the control process of the control unit 400, and the Obtained by at least one of the estimated values estimated in the control process. The physical quantity may be, for example, a voltage value, an operating speed, etc., in addition to the aforementioned current value and temperature. That is, the physical quantity includes at least one of current, voltage, temperature, and operating speed.
　以下、電力変換装置１が冷凍サイクル適用機器として空気調和機に搭載される場合における、図６および図７に示す各運転モードの概要について説明する。 An outline of each operation mode shown in FIGS. 6 and 7 when the power conversion device 1 is installed in an air conditioner as a refrigerating cycle device will be described below.
　運転モード１は、昇圧動作無し、振動抑制制御無し、過変調制御無し、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード１は、昇圧動作は行わず、メカ起因の振動も小さく、またモータ電圧飽和にも至らず、且つ負荷電流脈動、電源電流脈動も小さい場合の運転等に用いる。 Operation mode 1 is a combination of no boost operation, no vibration suppression control, no overmodulation control, no constant torque control, and no power supply ripple compensation control. The operation mode 1 is used for operation when no boosting operation is performed, mechanically-induced vibration is small, motor voltage saturation is not reached, and load current ripple and power supply current ripple are small.
　運転モード２は、昇圧動作無し、振動抑制制御無し、過変調制御無し、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード２は、昇圧動作は行わず、メカ起因の振動も小さく、またモータ電圧飽和にも至らず、且つ負荷電流脈動も小さいが、電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 2 is a combination of no boost operation, no vibration suppression control, no overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 2 does not perform boosting operation, causes less mechanical vibration, does not reach motor voltage saturation, and causes less load current pulsation.
　運転モード３は、昇圧動作無し、振動抑制制御有り、過変調制御無し、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード３は、昇圧動作は行わず、モータ電圧飽和にも至らず、また負荷電流脈動や電源電流脈動は小さいが、メカ起因の振動を抑制したい場合の運転等に用いる。 Operation mode 3 is a combination of no boost operation, vibration suppression control, no overmodulation control, no constant torque control, and no power supply ripple compensation control. Operation mode 3 does not perform boosting operation, does not reach motor voltage saturation, and is used for operation when it is desired to suppress mechanically-induced vibrations, although load current pulsation and power supply current pulsation are small.
　運転モード４は、昇圧動作無し、振動抑制制御有り、過変調制御無し、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード４は、昇圧動作は行わず、モータ電圧飽和にも至らず、また負荷電流脈動も小さいが、メカ起因の振動と電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 4 is a combination of no boost operation, vibration suppression control, no overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 4 does not perform boosting operation, does not reach motor voltage saturation, and has small load current pulsation, but is used for operation when it is desired to suppress mechanically-induced vibration and power supply current pulsation.
　運転モード５は、昇圧動作無し、振動抑制制御無し、過変調制御有り、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード５は、昇圧動作は行わず、メカ起因の振動は小さく、また負荷電流脈動や電源電流脈動は小さいが、モータ電圧飽和対策を行いたい場合の運転等に用いる。 Operation mode 5 is a combination of no boost operation, no vibration suppression control, overmodulation control, no constant torque control, and no power supply ripple compensation control. Operation mode 5 does not perform boosting operation, and is used for operation, etc., when it is desired to take countermeasures against motor voltage saturation, although mechanically-induced vibration is small and load current pulsation and power supply current pulsation are small.
　運転モード６は、昇圧動作無し、振動抑制制御無し、過変調制御有り、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード６は、昇圧動作は行わず、メカ起因の振動は小さく、また負荷電流脈動は小さいが、モータ電圧飽和対策と電源電流脈動抑制を行いたい場合の運転等に用いる。 Operation mode 6 is a combination of no boost operation, no vibration suppression control, overmodulation control, no constant torque control, and power supply ripple compensation control. Operation mode 6 does not perform boosting operation, and is used for operation when it is desired to take countermeasures against motor voltage saturation and power supply current pulsation suppression, although mechanically-induced vibration is small and load current pulsation is small.
　運転モード７は、昇圧動作無し、振動抑制制御有り、過変調制御有り、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード７は、昇圧動作は行わず、負荷電流脈動や電源電流脈動は小さいが、メカ起因の振動抑制とモータ電圧飽和対策を行いたい場合の運転等に用いる。 Operation mode 7 is a combination of no boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 7 does not perform boosting operation, and is used for operation when it is desired to suppress mechanically-induced vibration and prevent motor voltage saturation, although load current pulsation and power supply current pulsation are small.
　運転モード８は、昇圧動作無し、振動抑制制御有り、過変調制御有り、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード８は、昇圧動作は行わず、負荷電流脈動は小さいが、メカ起因の振動を抑制し、モータ電圧飽和対策と電源電流脈動対策を行いたい場合の運転等に用いる。 Operation mode 8 is a combination of no boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 8 does not perform boosting operation, and although load current pulsation is small, it is used for operation when it is desired to suppress mechanically-induced vibration and take measures against motor voltage saturation and power supply current pulsation.
　運転モード９は、昇圧動作無し、振動抑制制御無し、過変調制御無し、定トルク制御有り、および電源脈動補償制御無しの組み合わせである。運転モード９は、昇圧動作は行わず、メカ起因の振動は小さく、またモータ電圧飽和に至っておらず、且つ電源電流脈動も小さいが、負荷電流脈動による効率低下を抑制（省エネ運転）したい場合の運転等に用いる。 Operation mode 9 is a combination of no boost operation, no vibration suppression control, no overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 9 does not perform boosting operation, the vibration caused by the mechanism is small, the motor voltage is not saturated, and the power supply current ripple is small. Used for driving, etc.
　運転モード１０は、昇圧動作無し、振動抑制制御無し、過変調制御無し、定トルク制御有り、および電源脈動補償制御有りの組み合わせである。運転モード１０は、昇圧動作は行わず、メカ起因の振動は小さく、またモータ電圧飽和に至っていないが、負荷電流脈動による効率低下を抑え（省エネ運転）、電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 10 is a combination of no boost operation, no vibration suppression control, no overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 10 does not perform boosting operation, the vibration caused by the mechanism is small, and the motor voltage does not reach saturation, but suppresses the decrease in efficiency due to load current pulsation (energy saving operation), and the operation when it is desired to suppress power supply current pulsation. used for
　運転モード１１は、昇圧動作無し、振動抑制制御無し、過変調制御有り、定トルク制御有り、および電源脈動補償制御無しの組み合わせである。運転モード１１は、昇圧動作は行わず、メカ起因の振動は小さく、また電源電流脈動は小さいが、モータ電圧飽和対策を行い、負荷電流脈動による効率低下を抑えたい（省エネ運転）場合の運転等に用いる。 Operation mode 11 is a combination of no boost operation, no vibration suppression control, overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 11 does not perform boosting operation, has small mechanically-induced vibration, and has small power supply current pulsation. used for
　運転モード１２は、昇圧動作無し、振動抑制制御無し、過変調制御有り、定トルク制御有り、および電源脈動補償制御有りの組み合わせである。運転モード１２は、昇圧動作は行わず、メカ起因の振動は小さいが、モータ電圧飽和対策を行い、負荷電流脈動による効率低下を抑え（省エネ運転）、且つ電源電流脈動対策を行いたい場合の運転等に用いる。 Operation mode 12 is a combination of no boost operation, no vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 12 does not perform voltage step-up operation, and although mechanically-induced vibration is small, measures against motor voltage saturation are taken to suppress efficiency drops due to load current pulsations (energy-saving operation), and power supply current pulsations are to be taken. etc.
　運転モード１３は、昇圧動作有り、振動抑制制御無し、過変調制御無し、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード１３は、昇圧動作を行う際、メカ起因の振動も小さく、またモータ電圧飽和にも至らず、且つ負荷電流脈動・電源電流脈動も小さい場合の運転等に用いる。 Operation mode 13 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 13 is used for operation when the vibration caused by the mechanism is small, the motor voltage is not saturated, and the load current pulsation and the power supply current pulsation are small when the voltage boosting operation is performed.
　運転モード１４は、昇圧動作有り、振動抑制制御無し、過変調制御無し、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード１４は、昇圧動作を行う際、メカ起因の振動は小さく、モータ電圧飽和にも至らず、また負荷電流脈動も小さいが、電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 14 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 14 is used for operation when power source current pulsation is desired to be suppressed, although mechanically-induced vibration is small, motor voltage saturation does not occur, and load current pulsation is small when step-up operation is performed.
　運転モード１５は、昇圧動作有り、振動抑制制御有り、過変調制御無し、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード１５は、昇圧動作を行う際、モータ電圧飽和にも至らず、また負荷電流脈動や電源電流脈動は小さいが、メカ起因の振動を抑制したい場合の運転等に用いる。 Operation mode 15 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 15 is used when the motor voltage is not saturated and the load current pulsation and the power supply current pulsation are small when performing the boosting operation, but it is desired to suppress mechanical vibrations.
　運転モード１６は、昇圧動作有り、振動抑制制御有り、過変調制御無し、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード１６は、昇圧動作を行う際、モータ電圧飽和にも至らず、また負荷電流脈動も小さいが、メカ起因の振動と電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 16 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 16 is used when the motor voltage is not saturated and the load current pulsation is small when the voltage boosting operation is performed, but it is desired to suppress mechanically-induced vibration and power supply current pulsation.
　運転モード１７は、昇圧動作有り、振動抑制制御無し、過変調制御有り、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード１７は、昇圧動作を行う際、メカ起因の振動は小さく、また負荷電流脈動や電源電流脈動は小さいが、モータ電圧飽和対策を行いたい場合の運転等に用いる。 Operation mode 17 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 17 is used for operation when the vibration caused by the mechanism is small, and the load current pulsation and the power supply current pulsation are small when the step-up operation is performed, but the motor voltage saturation countermeasure is to be taken.
　運転モード１８は、昇圧動作有り、振動抑制制御無し、過変調制御有り、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード１８は、昇圧動作を行う際、メカ起因の振動は小さく、また負荷電流脈動は小さいが、モータ電圧飽和対策と電源電流脈動抑制を行いたい場合の運転等に用いる。 Operation mode 18 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 18 is used for operation when the vibration due to the mechanism is small and the load current ripple is small when performing the boosting operation, but the motor voltage saturation countermeasure and the power supply current ripple suppression are desired.
　運転モード１９は、昇圧動作有り、振動抑制制御有り、過変調制御有り、定トルク制御無し、および電源脈動補償制御無しの組み合わせである。運転モード１９は、昇圧動作を行う際、負荷電流脈動や電源電流脈動は小さいが、メカ起因の振動を抑制し、モータ電圧飽和対策を行いたい場合の運転等に用いる。 Operation mode 19 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 19 is used for operation when the load current pulsation and the power supply current pulsation are small when the voltage boosting operation is performed, but the mechanically-induced vibration is suppressed and the motor voltage saturation countermeasure is to be taken.
　運転モード２０は、昇圧動作有り、振動抑制制御有り、過変調制御有り、定トルク制御無し、および電源脈動補償制御有りの組み合わせである。運転モード２０は、昇圧動作を行う際、負荷電流脈動は小さいが、メカ起因の振動を抑制し、モータ電圧飽和対策と電源電流脈動対策を行いたい場合の運転等に用いる。 Operation mode 20 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. The operation mode 20 is used for operation when the load current pulsation is small when performing the boosting operation, but mechanically-induced vibration is suppressed, and countermeasures against motor voltage saturation and power supply current pulsation are desired.
　運転モード２１は、昇圧動作有り、振動抑制制御無し、過変調制御無し、定トルク制御有り、および電源脈動補償制御無しの組み合わせである。運転モード２１は、昇圧動作を行う際、メカ起因の振動は小さく、またモータ電圧飽和に至っておらず、且つ電源電流脈動も小さいが、負荷電流脈動による効率低下を抑制したい（省エネ運転）場合の運転等に用いる。 Operation mode 21 is a combination of boost operation, no vibration suppression control, no overmodulation control, constant torque control, and no power supply ripple compensation control. Operation mode 21 is used when boosting the voltage, the mechanical vibration is small, the motor voltage is not saturated, and the power supply current ripple is small. Used for driving, etc.
　運転モード２２は、昇圧動作有り、振動抑制制御無し、過変調制御無し、定トルク制御有り、および電源脈動補償制御有りの組み合わせである。運転モード２２は、昇圧動作を行う際、メカ起因の振動は小さく、またモータ電圧飽和に至っていないが、負荷電流脈動による効率低下を抑え（省エネ運転）、電源電流脈動を抑制したい場合の運転等に用いる。 Operation mode 22 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. In the operation mode 22, when the voltage is boosted, the vibration caused by the mechanism is small, and the motor voltage is not saturated, but the efficiency drop due to the load current pulsation is suppressed (energy-saving operation), and the power supply current pulsation is suppressed. used for
　運転モード２３は、昇圧動作有り、振動抑制制御無し、過変調制御有り、定トルク制御有り、および電源脈動補償制御無しの組み合わせである。運転モード２３は、昇圧動作を行う際、メカ起因の振動は小さく、また電源電流脈動は小さいが、モータ電圧飽和対策を行い、負荷電流脈動による効率低下を抑えたい（省エネ運転）場合の運転等に用いる。 Operation mode 23 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. Operation mode 23 is an operation in which the vibration caused by the mechanism is small and the power supply current pulsation is small when performing the boosting operation, but it is desired to suppress the efficiency drop due to the load current pulsation by taking measures against the motor voltage saturation (energy-saving operation). used for
　運転モード２４は、昇圧動作有り、振動抑制制御無し、過変調制御有り、定トルク制御有り、および電源脈動補償制御有りの組み合わせである。運転モード２４は、昇圧動作を行う際、メカ起因の振動は小さいが、モータ電圧飽和対策を行い、負荷電流脈動による効率低下を抑え（省エネ運転）、且つ電源電流脈動対策を行いたい場合の運転等に用いる。 Operation mode 24 is a combination of boost operation, vibration suppression control, overmodulation control, constant torque control, and power supply ripple compensation control. In operation mode 24, the mechanically-induced vibration is small when boosting, but the motor voltage saturation countermeasure is taken to suppress the efficiency drop due to the load current pulsation (energy-saving operation). etc.
　運転モード１から運転モード２４において、制御部４００は、例えば、コンデンサ２１０の容量に応じて電源脈動補償制御の有無を決定することができる。また、制御部４００は、モータ３１４が搭載された機器、すなわち圧縮機３１５の仕事量に応じて振動抑制制御の有無を決定することができる。 In operation modes 1 to 24, the control unit 400 can determine whether or not to perform power supply ripple compensation control according to the capacity of the capacitor 210, for example. In addition, the control unit 400 can determine whether or not to perform vibration suppression control according to the amount of work of the device in which the motor 314 is mounted, that is, the compressor 315 .
　制御部４００の動作を、フローチャートを用いて説明する。図８は、実施の形態１に係る電力変換装置１が備える制御部４００の動作を示すフローチャートである。制御部４００は、電力変換装置１の負荷状態を取得する（ステップＳ１）。制御部４００は、取得した負荷状態から各制御の有無を決定し、負荷状態に応じた運転モードを判定する（ステップＳ２）。制御部４００は、判定した運転モードが前回と同じか否かを確認する（ステップＳ３）。運転モードが前回と同じ場合（ステップＳ３：Ｙｅｓ）、制御部４００は、前回の運転モードを維持する（ステップＳ４）。運転モードが前回と異なる場合（ステップＳ３：Ｎｏ）、制御部４００は、運転モードを切り替える（ステップＳ５）。 The operation of the control unit 400 will be explained using a flowchart. FIG. 8 is a flow chart showing the operation of the control unit 400 included in the power conversion device 1 according to the first embodiment. The control unit 400 acquires the load state of the power converter 1 (step S1). The control unit 400 determines the presence or absence of each control from the acquired load state, and determines the operation mode according to the load state (step S2). The control unit 400 confirms whether or not the determined operation mode is the same as the previous time (step S3). If the operation mode is the same as last time (step S3: Yes), the control unit 400 maintains the previous operation mode (step S4). If the operating mode is different from the last time (step S3: No), the control unit 400 switches the operating mode (step S5).
　つづいて、電力変換装置１が備える制御部４００のハードウェア構成について説明する。図９は、実施の形態１に係る電力変換装置１が備える制御部４００を実現するハードウェア構成の一例を示す図である。制御部４００は、プロセッサ９１およびメモリ９２により実現される。 Next, the hardware configuration of the control unit 400 included in the power converter 1 will be described. FIG. 9 is a diagram showing an example of a hardware configuration that implements the control unit 400 included in the power conversion device 1 according to Embodiment 1. As shown in FIG. Control unit 400 is implemented by processor 91 and memory 92 .
　プロセッサ９１は、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ、中央処理装置、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータ、プロセッサ、ＤＳＰ（Ｄｉｇｉｔａｌ　Ｓｉｇｎａｌ　Ｐｒｏｃｅｓｓｏｒ）ともいう）、またはシステムＬＳＩ（Ｌａｒｇｅ　Ｓｃａｌｅ　Ｉｎｔｅｇｒａｔｉｏｎ）である。メモリ９２は、ＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）、フラッシュメモリー、ＥＰＲＯＭ（Ｅｒａｓａｂｌｅ　Ｐｒｏｇｒａｍｍａｂｌｅ　Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）、ＥＥＰＲＯＭ（登録商標）（Ｅｌｅｃｔｒｉｃａｌｌｙ　Ｅｒａｓａｂｌｅ　Ｐｒｏｇｒａｍｍａｂｌｅ　Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒy）といった不揮発性または揮発性の半導体メモリを例示できる。またメモリ９２は、これらに限定されず、磁気ディスク、光ディスク、コンパクトディスク、ミニディスク、またはＤＶＤ（Ｄｉｇｉｔａｌ　Ｖｅｒｓａｔｉｌｅ　Ｄｉｓｃ）でもよい。 The processor 91 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or a system LSI (Large Scale Integration). The memory 92 is a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory), a volatile memory or a non-volatile Read Only memory. A semiconductor memory can be exemplified. Moreover, the memory 92 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
　以上説明したように、本実施の形態によれば、電力変換装置１において、制御部４００は、各検出部から取得した検出値に基づいてインバータ３１０の動作を制御し、インバータ３１０に流れる電流Ｉ２に、整流部１３０から流れる電流Ｉ１の周波数成分に応じた周波数成分の脈動を重畳することで、平滑部２００に流れる電流Ｉ３を低減することとした。これにより、電力変換装置１は、平滑部２００に流れる電流Ｉ３が低減することによって、本実施の形態の制御を行わない場合と比較して、リプル電流耐量の小さなコンデンサ２１０の使用が可能となる。また、電力変換装置１は、コンデンサ電圧Ｖｄｃの脈動電圧が低下することによって、本実施の形態の制御を行わない場合と比較して、搭載するコンデンサ２１０の容量を小さくすることができる。電力変換装置１は、例えば、複数のコンデンサ２１０で平滑部２００を構成していた場合、平滑部２００を構成するコンデンサ２１０の本数を低減することができる。 As described above, according to the present embodiment, in the power conversion device 1, the control unit 400 controls the operation of the inverter 310 based on the detection values acquired from the respective detection units, and the current I2 flowing through the inverter 310 Furthermore, by superimposing the pulsation of the frequency component corresponding to the frequency component of the current I1 flowing from the rectifying unit 130, the current I3 flowing through the smoothing unit 200 is reduced. As a result, the electric power conversion device 1 reduces the current I3 flowing through the smoothing unit 200, so that the capacitor 210 having a smaller ripple current resistance can be used as compared with the case where the control of the present embodiment is not performed. . In addition, power conversion device 1 can reduce the capacity of capacitor 210 to be mounted as compared with the case where the control of the present embodiment is not performed, by reducing the pulsating voltage of capacitor voltage Vdc. For example, when the smoothing unit 200 is configured with a plurality of capacitors 210 , the power conversion device 1 can reduce the number of capacitors 210 configuring the smoothing unit 200 .
　また、電力変換装置１は、第２の交流電力に含まれる脈動が、整流部１３０から出力される電力の脈動よりも小さくなるようにインバータ３１０の動作を制御することによって、インバータ３１０に流れる電流Ｉ２に重畳する脈動成分が過大になるのを抑制できる。脈動成分の重畳は、インバータ３１０、モータ３１４などを通流する電流実効値を非重畳状態と比較して増加させることとなるが、重畳する脈動成分が過大になるのを抑制することによって、インバータ３１０の電流容量、インバータ３１０の損失増加、モータ３１４の損失増加などを抑制したシステムを提供することが可能となる。 In addition, the power conversion device 1 controls the operation of the inverter 310 so that the pulsation contained in the second AC power is smaller than the pulsation of the power output from the rectifying unit 130, so that the current flowing through the inverter 310 is reduced. It is possible to suppress the pulsation component superimposed on I2 from becoming excessive. The superimposition of the pulsating component increases the effective value of the current flowing through the inverter 310, the motor 314, etc. compared to the non-superimposed state. It is possible to provide a system that suppresses the current capacity of the inverter 310, the loss increase of the inverter 310, the loss increase of the motor 314, and the like.
　また、電力変換装置１は、本実施の形態の制御を行うことによって、電流Ｉ２の脈動に起因して発生する圧縮機３１５の振動を抑制することができる。 In addition, the power converter 1 can suppress the vibration of the compressor 315 caused by the pulsation of the current I2 by performing the control of the present embodiment.
　また、電力変換装置１は、昇圧部６００が昇圧動作を行うことによって、コンデンサ２１０のコンデンサ電圧Ｖｄｃを上昇させ、インバータ３１０の出力可能電圧範囲を拡大することができる。電力変換装置１において、制御部４００は、昇圧部６００のスイッチング素子６３２に対する駆動信号に、インバータ３１０から出力する第２の交流電力に含まれる脈動の周波数成分を重畳することで、当該周波数成分に起因する電流Ｉ３およびコンデンサ電圧Ｖｄｃの脈動を低減することができる。 In addition, the power conversion device 1 can increase the capacitor voltage Vdc of the capacitor 210 and expand the output voltage range of the inverter 310 by performing the boosting operation of the booster 600 . In the power conversion device 1, the control unit 400 superimposes the pulsation frequency component included in the second AC power output from the inverter 310 on the driving signal for the switching element 632 of the boosting unit 600, thereby increasing the frequency component. The resulting pulsation of current I3 and capacitor voltage Vdc can be reduced.
　また、電力変換装置１は、負荷状態に応じて運転モードを維持または切り替える。これにより、電力変換装置１は、不要に処理負荷を上げることなく、可能な場合には省エネ運転を行うことができる。 Also, the power converter 1 maintains or switches the operation mode according to the load state. As a result, the power electronics device 1 can perform energy-saving operation when possible without increasing the processing load unnecessarily.
実施の形態２．
　図１０は、実施の形態２に係る冷凍サイクル適用機器９００の構成例を示す図である。実施の形態２に係る冷凍サイクル適用機器９００は、実施の形態１で説明した電力変換装置１を備える。実施の形態２に係る冷凍サイクル適用機器９００は、空気調和機、冷蔵庫、冷凍庫、ヒートポンプ給湯器といった冷凍サイクルを備える製品に適用することが可能である。なお、図１０において、実施の形態１と同様の機能を有する構成要素には、実施の形態１と同一の符号を付している。 Embodiment 2.
FIG. 10 is a diagram showing a configuration example of a refrigeration cycle device 900 according to Embodiment 2. As shown in FIG. A refrigerating cycle-applied equipment 900 according to the second embodiment includes the power converter 1 described in the first embodiment. The refrigerating cycle applied equipment 900 according to Embodiment 2 can be applied to products equipped with a refrigerating cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters. In FIG. 10, constituent elements having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.
　冷凍サイクル適用機器９００は、実施の形態１におけるモータ３１４を内蔵した圧縮機３１５と、四方弁９０２と、室内熱交換器９０６と、膨張弁９０８と、室外熱交換器９１０とが冷媒配管９１２を介して取り付けられている。 Refrigerating cycle applied equipment 900 includes compressor 315 incorporating motor 314 according to Embodiment 1, four-way valve 902, indoor heat exchanger 906, expansion valve 908, and outdoor heat exchanger 910 with refrigerant pipe 912. attached through
　圧縮機３１５の内部には、冷媒を圧縮する圧縮機構９０４と、圧縮機構９０４を動作させるモータ３１４とが設けられている。 A compression mechanism 904 that compresses the refrigerant and a motor 314 that operates the compression mechanism 904 are provided inside the compressor 315 .
　冷凍サイクル適用機器９００は、四方弁９０２の切替動作により暖房運転又は冷房運転をすることができる。圧縮機構９０４は、可変速制御されるモータ３１４によって駆動される。 The refrigeration cycle applied equipment 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902 . The compression mechanism 904 is driven by a variable speed controlled motor 314 .
　暖房運転時には、実線矢印で示すように、冷媒が圧縮機構９０４で加圧されて送り出され、四方弁９０２、室内熱交換器９０６、膨張弁９０８、室外熱交換器９１０及び四方弁９０２を通って圧縮機構９０４に戻る。 During heating operation, as indicated by solid line arrows, the refrigerant is pressurized by the compression mechanism 904 and sent out through the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, the outdoor heat exchanger 910, and the four-way valve 902. Return to compression mechanism 904 .
　冷房運転時には、破線矢印で示すように、冷媒が圧縮機構９０４で加圧されて送り出され、四方弁９０２、室外熱交換器９１０、膨張弁９０８、室内熱交換器９０６及び四方弁９０２を通って圧縮機構９０４に戻る。 During cooling operation, as indicated by dashed arrows, the refrigerant is pressurized by the compression mechanism 904 and sent through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906, and the four-way valve 902. Return to compression mechanism 904 .
　暖房運転時には、室内熱交換器９０６が凝縮器として作用して熱放出を行い、室外熱交換器９１０が蒸発器として作用して熱吸収を行う。冷房運転時には、室外熱交換器９１０が凝縮器として作用して熱放出を行い、室内熱交換器９０６が蒸発器として作用し、熱吸収を行う。膨張弁９０８は、冷媒を減圧して膨張させる。 During heating operation, the indoor heat exchanger 906 acts as a condenser to release heat, and the outdoor heat exchanger 910 acts as an evaporator to absorb heat. During cooling operation, the outdoor heat exchanger 910 acts as a condenser to release heat, and the indoor heat exchanger 906 acts as an evaporator to absorb heat. The expansion valve 908 reduces the pressure of the refrigerant to expand it.
　以上の実施の形態に示した構成は、一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、実施の形態同士を組み合わせることも可能であるし、要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above embodiment is an example, and can be combined with another known technique, or can be combined with other embodiments, without departing from the scope of the invention. It is also possible to omit or change part of the configuration.
　１　電力変換装置、２　モータ駆動装置、１１０　商用電源、１２０，６３１　リアクトル、１３０　整流部、１３１～１３４，６２１～６２４　整流素子、２００　平滑部、２１０　コンデンサ、３１０　インバータ、３１１ａ～３１１ｆ，６１１～６１４，６３２　スイッチング素子、３１２ａ～３１２ｆ　還流ダイオード、３１３ａ，３１３ｂ，５０１，５０２　電流検出部、３１４　モータ、３１５　圧縮機、４００　制御部、６００，６０１　昇圧部、６３３　ダイオード、７００，７０１，７０２　整流昇圧部、９００　冷凍サイクル適用機器、９０２　四方弁、９０４　圧縮機構、９０６　室内熱交換器、９０８　膨張弁、９１０　室外熱交換器、９１２　冷媒配管。 1 power conversion device, 2 motor drive device, 110 commercial power supply, 120, 631 reactor, 130 rectification section, 131 to 134, 621 to 624 rectification element, 200 smoothing section, 210 capacitor, 310 inverter, 311a to 311f, 611 to 614 , 632 switching elements, 312a to 312f freewheeling diodes, 313a, 313b, 501, 502 current detectors, 314 motors, 315 compressors, 400 controllers, 600, 601 boosters, 633 diodes, 700, 701, 702 rectifier boosters , 900 refrigeration cycle application equipment, 902 four-way valve, 904 compression mechanism, 906 indoor heat exchanger, 908 expansion valve, 910 outdoor heat exchanger, 912 refrigerant piping.

Claims (9)

  1. 　商用電源から供給される第１の交流電力を整流するとともに、前記第１の交流電力の電圧を昇圧する整流昇圧部と、
    　前記整流昇圧部の出力端に接続されるコンデンサと、
    　前記コンデンサの両端に接続され、前記整流昇圧部および前記コンデンサから出力される電力を第２の交流電力に変換し、モータが搭載された機器に出力するインバータと、
    　前記整流昇圧部の動作を制御するとともに、前記整流昇圧部から前記コンデンサに流入する電力の脈動に応じた脈動を含む前記第２の交流電力を前記インバータから前記機器に出力するように前記インバータの動作を制御し、前記コンデンサに流れる電流を抑制する制御部と、
    　を備え、
    　前記制御部は、前記インバータ、前記モータ、および前記機器の動作状態である負荷状態に応じて運転モードを判定する電力変換装置。     a rectifying and boosting unit that rectifies first AC power supplied from a commercial power supply and boosts the voltage of the first AC power;
    a capacitor connected to the output terminal of the rectifying and boosting unit;
    an inverter connected to both ends of the capacitor for converting the power output from the rectifying and boosting unit and the capacitor into second AC power and outputting the second AC power to a device equipped with a motor;
    The inverter controls the operation of the rectifying and boosting section and outputs the second AC power including pulsation corresponding to the pulsation of the power flowing into the capacitor from the rectifying and boosting section to the device. a control unit that controls the operation and suppresses the current flowing through the capacitor;
    with
    The control unit is a power conversion device that determines an operation mode according to a load state that is an operation state of the inverter, the motor, and the equipment.
  2. 　前記運転モードは、前記整流昇圧部の動作、前記モータまたは前記機器の振動を低減する振動抑制制御、前記インバータの過変調制御、前記モータに対する定トルク制御、および前記コンデンサの充放電電流を抑制する電源脈動補償制御、の各有無の組み合わせである、
    　請求項１に記載の電力変換装置。     The operation mode includes operation of the rectifying and boosting unit, vibration suppression control to reduce vibration of the motor or the device, overmodulation control of the inverter, constant torque control of the motor, and suppression of charge/discharge current of the capacitor. A combination of the presence and absence of power supply pulsation compensation control,
    The power converter according to claim 1.
  3. 　前記運転モードに、弱め磁束制御を含む、
    　請求項２に記載の電力変換装置。     The operating mode includes flux-weakening control,
    The power converter according to claim 2.
  4. 　前記制御部は、前記コンデンサの容量に応じて前記電源脈動補償制御の有無を決定する、
    　請求項２または３に記載の電力変換装置。     The control unit determines whether or not to perform the power supply ripple compensation control according to the capacitance of the capacitor.
    The power converter according to claim 2 or 3.
  5. 　前記制御部は、前記機器の仕事量に応じて前記振動抑制制御の有無を決定する、
    　請求項２から４のいずれか１つに記載の電力変換装置。     The control unit determines whether or not to perform the vibration suppression control according to the workload of the device.
    The power converter according to any one of claims 2 to 4.
  6. 　前記負荷状態は、前記インバータまたは前記モータまたは前記機器を検出対象とした物理量の検出値、前記制御部の制御過程で生成される指令値、および前記制御部の制御過程で推定される推定値のうち少なくとも１つによって得られる、
    　請求項１から５のいずれか１つに記載の電力変換装置。     The load state includes a detected value of a physical quantity whose detection target is the inverter, the motor, or the device, a command value generated in the control process of the control unit, and an estimated value estimated in the control process of the control unit. obtained by at least one of
    The power converter according to any one of claims 1 to 5.
  7. 　前記物理量に電流、電圧、温度、運転速度のうち少なくとも１つが含まれる、
    　請求項６に記載の電力変換装置。     The physical quantity includes at least one of current, voltage, temperature, and operating speed.
    The power converter according to claim 6.
  8. 　請求項１から７のいずれか１つに記載の電力変換装置を備えるモータ駆動装置。 A motor drive device comprising the power conversion device according to any one of claims 1 to 7.
  9. 　請求項１から７のいずれか１つに記載の電力変換装置を備える冷凍サイクル適用機器。 A refrigerating cycle application device comprising the power converter according to any one of claims 1 to 7.
PCT/JP2021/005358 2021-02-12 2021-02-12 Power conversion device, motor driving device, and refrigeration-cycle application instrument WO2022172418A1 (en)

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CN202180092491.5A CN116783810A (en) 2021-02-12 2021-02-12 Power conversion device, motor drive device, and refrigeration cycle application device
PCT/JP2021/005358 WO2022172418A1 (en) 2021-02-12 2021-02-12 Power conversion device, motor driving device, and refrigeration-cycle application instrument
JP2022581131A JPWO2022172418A1 (en) 2021-02-12 2021-02-12
US18/259,340 US20240063708A1 (en) 2021-02-12 2021-02-12 Power converter, motor driving apparatus, and refrigeration cycle applied apparatus

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002354826A (en) * 2001-05-24 2002-12-06 Isao Takahashi Inverter controlling method and its appartaus
JP2018057207A (en) * 2016-09-30 2018-04-05 ダイキン工業株式会社 Power converter control device
JP2018088741A (en) * 2016-11-28 2018-06-07 東芝キヤリア株式会社 Motor driving device and control method thereof
WO2019082316A1 (en) * 2017-10-25 2019-05-02 東芝三菱電機産業システム株式会社 Power conversion device
JP2019161757A (en) * 2018-03-08 2019-09-19 ナブテスコ株式会社 Ac-ac power conversion device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002354826A (en) * 2001-05-24 2002-12-06 Isao Takahashi Inverter controlling method and its appartaus
JP2018057207A (en) * 2016-09-30 2018-04-05 ダイキン工業株式会社 Power converter control device
JP2018088741A (en) * 2016-11-28 2018-06-07 東芝キヤリア株式会社 Motor driving device and control method thereof
WO2019082316A1 (en) * 2017-10-25 2019-05-02 東芝三菱電機産業システム株式会社 Power conversion device
JP2019161757A (en) * 2018-03-08 2019-09-19 ナブテスコ株式会社 Ac-ac power conversion device

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